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JEEMAIN and NEET
>>
Mathematics
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Class11
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3-D Geometry
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Q)
If the planes
x
=
c
y
+
b
z
,
y
=
a
z
+
c
x
,
z
=
b
x
+
a
y
pass through a line then
a
2
+
b
2
+
c
2
+
2
a
b
c
=
?
(
a
)
0
(
b
)
1
(
c
)
2
(
d
)
−
1.
</p
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Ans is 1.
Since, x=cy+bz----(1)
y=az+cx----(2)
and z=bx+ay----(3)
by cancellation z from (1)&(2) by help (3) we get,
(1-b^2)x=(c+ab) y
=>x/y=(c+ab)/(1-b^2) ----(4)
&(1-a^2)y=(c+ab) x
=>y/x=(c+ab)/(1-a^2) -----(5)
now by multiplying(4)&(5) we get,
1=(c^2+2abc+a^2b^2)/(1-a^2-b^2+a^2b^2)
=> a^2+b^2+c^2+2abc=1.
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