Question

Let \(A=\left(\begin{array}{ccc}12 & 24 & 5 \\ x & 6 & 2 \\ -1 & -2 & 3\end{array}\right) .\) The value of \(x\) for which the matrix \(A\) is not invertible is
(A) 6
(B) 12
(C) 3
(D) 2

Answer 1

Ans: (C)
Hint : If matrix is not invertible \(\Rightarrow|A|=0\)
\(\therefore|\mathrm{A}|=\left|\begin{array}{ccc}12 & 24 & 5 \\ \mathrm{x} & 6 & 2 \\ -1 & -2 & 3\end{array}\right|=0 \Rightarrow \mathrm{x}=3\)

Answer 2

us cialis sales <a href="https://ordergnonline.com/">buy generic tadalafil 40mg</a> can i buy ed pills over the counter

Answer 3

buying cialis cheap <a href="https://ordergnonline.com/">cheap cialis without prescription</a> new ed drugs

Answer 4

professional dating sites: <a href=" https://datingtopreview.com/# ">american singles</a> - free datinsites chat

Answer 5

<a href="https://metforminvip.com/">metformin and alcohol</a>

Answer 6

<a href="https://zoloftnew.com/">zoloft adhd</a>

Answer 7

<a href="https://glucophagecan.com/">glucophage bleeding</a>

Answer 8

<a href="https://amoxicillininfo24.com/">what is amoxicillin good for</a>

Answer 9

<a href="https://escitalopraminfo24.com/">escitalopram doses</a>

Answer 10

<a href="https://ddavpinfo.com/">adh vs ddavp</a>