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Questions  >>  SAT  >>  Math  >>  Quadratic Equations
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In the equation given below, $K$ is a constant, if $x=6$, what is the value of $K$ ? <br> $\qquad \qquad \sqrt{K^2+9} -x =0$

$\begin{array}{1 1} (a)\;3\sqrt{3} \\ (b)\; 2\sqrt{3} \\ (c)\; 3 \\ (d)\; 9 \end{array}$

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