3 and 4 .Determinants and Matrices
easy

समीकरण $\left| {\,\begin{array}{*{20}{c}}0&x&{16}\\x&5&7\\0&9&x\end{array}\,} \right| = 0$ के मूल हैं

A

$0,\,\,12,\,\,12$

B

$0, 12, -12$

C

$0, 12, 16$

D

$0, 9, 16$

Solution

(b) $\left| {\,\begin{array}{*{20}{c}}0&x&{16}\\x&5&7\\0&9&x\end{array}\,} \right|\, = \,0$

प्रसार करने पर$ – x({x^2} – 144) = 0$

 $ \Rightarrow $ $x = 0$ or ${x^2} = 144$$ \Rightarrow $ $x = \pm 12$

$\therefore$  $x = 0$, $12,$ $ – 12$.

Standard 12
Mathematics

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