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Answers posted by sreemathi.v
Questions
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If $\alpha$ and $\beta$ are the zeroes of the polynomial $f(x)=6x^2+x-2$,then the value of $\large\frac{\alpha}{\beta}+\frac{\beta}{\alpha}$ is
answered
Oct 20, 2014
Answer : $\large\frac{-25}{12}$
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If $1$ is $'a'$ zero of the polynomial $P(x)=ax^2-3(a-1)x-1$,then the value of $a$ is
answered
Oct 20, 2014
Answer : $1$
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The product of the zeroes of $x^3+4x^2+x-6$ is
answered
Oct 20, 2014
Given f(x) = $x^3+4x^2+x-6$$$\alpha\beta\gamma = \frac {-d}{d} = -(\frac{-6}{1})$Ans = 6
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If $x+2$ is a factor of $x^2+ax+2b$ and $a+b=4$,then
answered
Oct 20, 2014
$\text {Since} x+2$ is a factor of $x^2+ax+2b$$ P (-2) = (-2)^2 + a (-2) + 2b = 0$$ \implies { 4 - ...
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If the zeroes of the polynomial $f(x)=x^3-12x^2+39x-28$ is in A.P,then its zeroes are _____
answered
Oct 20, 2014
$f(x)=x^3-12x^2+39x-28$Let a-d, a, a+d be the zeroes of the Polynominal$\text {Sum of Zeroes} = - (...
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Find the zeroes of the polynomial $f(x)=x^3-5x^2-2x+24$ if it is given that the product of its two zeroes is $12$.
answered
Oct 20, 2014
$f(x)=x^3-5x^2-2x+24$$ \text {Let} \; \alpha\beta = 12$$ \alpha + \beta + \gamma = - (-5) = 5$$ \alp...
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If fourth degree of a polynomial is divided by a quadratic polynomial,then the degree of its remainder is _______
answered
Oct 20, 2014
Answer : $\leq1$
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For what value of $k$ is $-4$ a zero of the polynomial $x^2-x-(2k+2)$?
answered
Oct 20, 2014
Let P(x) = $x^2-x-(2k+2)$$ P(-4) = (-4)^2 - (-4) - (2k + 2) = 0$$ \implies 16 + 4 - 2k - 2 = 0$$ \im...
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If $f(x)=x^3+x^2-ax+b$ is divided by $x^2-x$ then the values of $a$ and $b$ are ______
answered
Oct 20, 2014
Solution : https://clay6.com/mpaimg/a5.jpgAnswer : $a=2,b=0$Class of polynomialsIf the remainder is ...
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The values of $a$ and $b$ if $f(x)=x^4+x^3+8x^2+ax+b$ is divided by $x^2+1$ is _____
answered
Oct 20, 2014
Solution : https://clay6.com/mpaimg/ap50.jpgSince the remainder is zero $x(a+1)=0$$=> a=-1$and $b...
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If two zeroes of the polynomial $3x^4+6x^3-2x^2-10x-5$ are $\sqrt{\large\frac{5}{3}}$ and $-\sqrt{\large\frac{5}{3}}$ then its other zeroes are _____
answered
Oct 20, 2014
The given roots are 53√\sqrt{\frac{5}{3}} and - 53√\sqrt{\frac{5}{3}}The equation formed by the give
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If the polynomial $f(x)=3x^2-x^3-3x+5$ is divided by a polynomial $g(x)=x-1-x^2$ ,then its quotient is _____
answered
Oct 20, 2014
Answer : $x-2$
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If the zeroes of the polynomial $f(x)=x^3-12x^2+39x+k$ are in A.P then the value of $k$ is _____
answered
Oct 20, 2014
Answer : $-28$
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If $\sqrt 5$ and $-\sqrt 5$ are the two zeroes of the polynomial $x^3+3x^2-5x-15$,then its third zero is ______
answered
Oct 20, 2014
Answer : $-3$
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If two zeroes of the polynomial $f(x)=x^3+x^2-5x-5$ are $\sqrt 5$ and $-\sqrt 5$ then the third zero is ____
answered
Oct 20, 2014
Answer : $-1$
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If the zeroes of the polynomial $f(x)=x^3-3px^2+qx-r$ are in A.P,then ______
answered
Oct 20, 2014
Let a - d, a and a+d be the zero of the polynomial; $x^3-px^2+qx-r$a - d + a + a + d = -(-p) /1 = p$...
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If the product of two zeroes of the polynomial $f(x)=2x^3+6x^2-4x+9$ is $3$,then its third zero is ______
answered
Oct 20, 2014
Answer : $-\large\frac{3}{2}$
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If $\alpha$ and $\beta$ are the roots of the equation $5y^2-7y+1=0$,then the value of $\big(\large\frac{1}{\alpha}+\frac{1}{\beta}\big)$ is _______
answered
Oct 20, 2014
Given, $5y^2-7y+1=0$$\alpha + \beta = -(\frac{-7}{5}) = \frac{7}{5}$ and $\alpha\beta = \frac{1}{5}$...
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The value of $k$ for which the quadratic equation $9x^2+8kx+16=0$ has equal roots is _______
answered
Oct 20, 2014
Solution : given $9x^2+8kx+16=0$Since it has equal roots$b^2-4ac=0$=> $(8k)^2 -4 \times 9 \times ...
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If $\alpha$ and $\beta$ are the roots of the equation $x^2+4x+12=0$ such that $\alpha-\beta=1$,then the value of $k$ is _______
answered
Oct 20, 2014
Solution : Sum of the roots $= \alpha +\beta= \large\frac{-4}{1}$ (ie) $1+\beta +\beta=-4$$2 \beta=-...
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If the sum of the roots of the equation $x^2-x=k(2x-1)$ is zero,then the value of $k$ is ______
answered
Oct 20, 2014
Answer : $-\large\frac{1}{2}$
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If $\alpha,\beta$ are the roots of the equation $4x^2-5x-1=0$,then the values of $\alpha^2\beta+\alpha\beta^2$ is _________
answered
Oct 20, 2014
Answer : $\large\frac{-5}{16}$
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The factors for the quadratic equation $4x^2+4bx-(a^2-b^2)=0$ are ________
answered
Oct 18, 2014
Answer : $(2x-(a-b)),(2x+(a+b))$
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The factors for the quadratic equation $a^2x^2-3abx+2b^2=0$ are ______
answered
Oct 18, 2014
Answer : $(ax-2b),(ax-b)$
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The factors for the quadratic equation $\large\frac{4}{x}$$-3=\large\frac{5}{2x+3}$ are __________
answered
Oct 18, 2014
Answer : $(x+2),(x-1)$
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The factors for the quadratic equation $\large\frac{1}{x-2}+\frac{2}{x-1}=\frac{6}{x}$ is ______
answered
Oct 18, 2014
Solution : given $\large\frac{1}{x-2}+\frac{2}{x-1}=\frac{6}{x}$=> $\large\frac{x-1 +2(x-2)}{(x-2...
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The factors for the equation $\large\frac{x}{x+1}+\frac{x+1}{x}=\frac{34}{15}$ is ________
answered
Oct 18, 2014
Tag it a class 10 quadratic equation$ Given : \large\frac{x}{x+1}+\frac{x+1}{x}=\frac{34}{15}$$\begi...
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The value of $k$ such that the sum of the squares of the roots of the quadratic equation $x^2-8x+k=0$ is $40$ is _______
answered
Oct 18, 2014
Given $x^2-8x+k=0$also $\alpha^2 + \beta^2 = 40 \implies (\alpha + \beta)^2 - 2\alpha\beta = 40$sum ...
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If $\alpha$ and $\beta$ are roots of the quadratic equation $kx^2+4x+4=0$ ,then the value of $k$ such that $\alpha^2+\beta^2=24$ is ______
answered
Oct 18, 2014
Answer : $k=-1$ or $\large\frac{2}{3}$
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If $\alpha$ and $\beta$ be the roots of the quadratic equation $x^2-5x+k=0$,then the value of $k$,such that $\alpha-\beta=1$ is _________
answered
Oct 18, 2014
$ \text {Given:} \; \alpha - \beta = 1 \implies \; \alpha = 1 + \beta$$ \text {also} \; x^2 - 5x + K...
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votes
If $\alpha$ and $\beta$ are the roots of the equation $x^2-3x+k=0$ such that $\alpha=2\beta$,then the value of $k$ is ________
answered
Oct 18, 2014
Given $\alpha = 2\beta $ and $x^2 - 3x + k = 0$ $\begin{align*}\text{Sum of the roots} = 2 \beta + \...
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votes
If one root of the quadratic equation $ax^2+bx+c=0$ is double the other ,then $2b^2=$________
answered
Oct 18, 2014
Given : One root is double the other (i.e) $\beta = 2\alpha$ $ ax^2 + bx + c = 0 $ Sum of the roots ...
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If one root of the equation $4x^2+5x+\lambda=0$ be the reciprocal of another root,then the value of $\lambda$ is ______
answered
Oct 17, 2014
$4x^2+5x+\lambda=0$also $\beta = \frac{1}{\alpha}$sum of the roots is $\alpha + \frac{1}{\alpha} = \...
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votes
The value of $k$ so that the equation $x^2-(k+6)x+2(2k-1)=0$ has sum of the roots as half of their product is _________
answered
Oct 17, 2014
Given$x^2 - (k+6)x + 2(2k-1) = 0$ sum of the roots = $\frac{1}{2}$ product of rootssum of the roots ...
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votes
One root of the equation $2x^2-8x-m=0$ is $\large\frac{5}{2}$,then the other root and the value of $m$ is _______
answered
Oct 17, 2014
Answer : $m=\large\frac{-15}{2}$; second root is $\large\frac{3}{2}$
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If the sum of the roots of the quadratic equation $3x^2+(2k+1)x-(k+5)=0$ is equal to the product of the roots, then the value of $k$ is ________
answered
Oct 17, 2014
$3x^2+(2k+1)x-(k+5)=0$ a = 3, b = (2k + 1) , c = -(k + 5)Given $\implies$ Sum of the roots = Produc...
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A quadratic equation one of whose roots is $\sqrt 5$ and the product of whose roots is $-2\sqrt 5$ is ________
answered
Oct 17, 2014
Answer : $x^2+(2-\sqrt 5)x-2\sqrt 5=0$
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The roots of the polynomial $x^2-(\sqrt 2+1)x+\sqrt 2=0$ is ___________
answered
Oct 17, 2014
Polynomial $ x^2 - (\sqrt2 + 1 )x + \sqrt2 = 0$$x^2 - \sqrt2x - x + \sqrt2 = 0$$x(x - \sqrt2) - 1(x ...
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votes
The roots of the polynomial $\large\frac{x-a}{x-b}+\frac{x-b}{x-a}=\frac{a}{b}+\frac{b}{a}$ is _________
answered
Oct 17, 2014
quadratic equation $\large\frac{x-a}{x-b}+\frac{x-b}{x-a}=\frac{a}{b}+\frac{b}{a}$$\implies \frac{(x...
0
votes
The roots of the polynomial $x^2+2ab=(2a+b)x$ is ______
answered
Oct 17, 2014
$x^2+2ab=(2a+b)x$$\implies x^2 -(2a + b)x + 2ab = 0$$\implies x^2 -2ax - bx +2ab = 0$$\implies x(x-2...
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votes
The zeroes of the polynomial $x^2+x-(a+1)(a+2)=0$ is ____________
answered
Oct 17, 2014
Answer : $x=-\large\frac{a}{a+b};\frac{-(a+b)}{a}$
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votes
The zeroes for $x=\large\frac{1}{2-\Large\frac{1}{2-\Large\frac{1}{(2-x)}}},$$x\neq 2$ is ____________
answered
Oct 17, 2014
Answer : $x=1,1$Given $x=\large\frac{1}{2-\Large\frac{1}{2-\Large\frac{1}{(2-x)}}}$(ie) $x=\large\fr...
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votes
If one root of the equation $2x^2+kx-6=0$ is $2$,then the other root is ____________
answered
Oct 17, 2014
Answer : $\large\frac{-3}{2}$
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votes
If $x=\large\frac{2}{3}$ and $x=-3$ are the roots of the equation $ax^2+7x+6=0$,then the values of $a$ and $b$ are ________
answered
Oct 17, 2014
$ax^2+7x+6=0$$P(\frac{2}{3})= a(\frac{2}{3})^2 + 7(\frac{2}{3}) + b = 0$$\implies \frac{4a}{9} + \fr...
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votes
If one root of the equation $2x^2+kx-6=0$ is $2$,then the value of $k$ is ____________
answered
Oct 17, 2014
$P(2) = 2(2)^2 + k(2 - 6 = 0)$$\implies 8 + 2k - 6 = 0$$\therefore k = -1$
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votes
If $x=2$ and $x=3$ are the roots of the equation $3x^2-2kx+2m$,then the values of $k$ and $m$ is ____________
answered
Oct 17, 2014
Answer : $k=\large\frac{15}{2},\normalsize m=9$
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votes
If $x=-a$ is the root of the solution $x^2+2ax-k=0$ then the value of $k$ is ________
answered
Oct 17, 2014
$x = -a^2$$\begin{align*}P(-a) = a^2 + 2a(-a) -k & = 0 \\ a^2 - 2a^2 - k & = 0 \\ \therefore...
0
votes
Show that the point $(x,y)$ given by $x=\large\frac{2at}{1+t^2}$ and $y=\large\frac{a(1-t^2)}{1+t^2}$ lies on a circle for all real values of $t$ such that $-1\leq t \leq 1$ where $a$ is any given real numbers.
answered
Oct 17, 2014
Toolbox:equation of a circle passing through the origin is $x^2+y^2=a^2$ where $a$ is the radius.The...
0
votes
Equation of the hyperbola with eccentricity $\large\frac{3}{2}$ and foci at $(\pm 2,0)$ is
answered
Oct 17, 2014
Toolbox:General equation of hyperbola which lies on the $x$-axis is $\large\frac{x^2}{a^2}-\frac{y^2...
0
votes
The distance between the foci of a hyperbola is $16$ and its eccentricity is $\sqrt 2$.Its equation is
answered
Oct 17, 2014
Toolbox:General equation of a hyperbola which lies on the $y$ axis is $\large\frac{x^2}{a^2}-\frac{...
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