If $\left| \begin{array}{r} - 12\ \ \ \ \ 0\ \ \ \ \ \ \ \ \ \lambda \ 0\ \ \ \ \ \ \ 2\ \ \ \ - 1 \ 2\ \ \ \ \ \ \ 1\ \ \ \ \ \ \ 15 \end{array} ight| = - 360,\$then the value of $\lambda$ is

Question

If $\left| \begin{array}{r} - 12\ \ \ \ \ 0\ \ \ \ \ \ \ \ \ \lambda \ 0\ \ \ \ \ \ \ 2\ \ \ \ - 1 \ 2\ \ \ \ \ \ \ 1\ \ \ \ \ \ \ 15 \end{array} ight| = - 360,\$then the value of $\lambda$ is

Dr. Abubacker · Accepted Answer

(c)
$\left| \begin{array}{r}
 - 12\ \ \ \ \ 0\ \ \ \ \ \ \ \ \ \lambda \
0\ \ \ \ \ \ \ 2\ \ \ \  - 1 \
2\ \ \ \ \ \ \ 1\ \ \ \ \ \ \ 15
\end{array} ight|$=-360
$\Rightarrow \ \  - 12(30 + 1) - 4\lambda = - 360$
$\Rightarrow \ \ \  - 372 + 360 = 4\ \lambda\ \  \Rightarrow \ \ \ \lambda = - \frac{12}{4} = - 3$

Q. If $\left| \begin{array}{r} - 12\ \ \ \ \ 0\ \ \ \ \ \ \ \ \ \lambda \\ 0\ \ \ \ \ \ \ 2\ \ \ \ - 1 \\ 2\ \ \ \ \ \ \ 1\ \ \ \ \ \ \ 15 \end{array} \right| = - 360,\$then the value of $\lambda$ is

Explanation

Reviewed by Dr. Abubacker

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