If A= [ ll 3 & 4 5 & 2 ] and 2A + B is a null matrix, then B is e… - Vidyadip

Question

If $A=\left[\begin{array}{ll}3 & 4 \\ 5 & 2\end{array}\right]$ and 2A + B is a null matrix, then B is equal to:

✓

Answer

(c) $\left[\begin{array}{ll}-6 & -8 \\ -10 & -4\end{array}\right]$
Explanation: $\left[\begin{array}{ll}-6 & -8 \\ -10 & -4\end{array}\right]$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Model Paper 3→Model Paper 3 — all question types→MATHS STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

$\text{The value of}\ \hat{\text{i}}\cdot(\hat{\text{j}}\times\hat{\text{k}})+\hat{\text{j}}\cdot(\hat{\text{i}}\times\hat{\text{k}})+\hat{\text{k}}\cdot(\hat{\text{i}}\times\hat{\text{j}})\ \text{is}$

0
-1
1
3

A box contains 10 good articles and 6 with defects. One item is drawn at random. The probability that it is either good or has a defect is,

$\frac{64}{64}$
$\frac{49}{64}$
$\frac{40}{64}$
$\frac{24}{64}$

If from Lagrange's mean value theorem, we have
$\text{f}'(\text{x}_1)=\frac{\text{f}(\text{b})-\text{f}(\text{a})}{\text{b}-\text{a}},$ then:

Choose the correct answer in exercise:
$\int\frac{\text{dx}}{\text{x}(\text{x}^2+1)}$ equals

The distinct linear functions that map $[-1, 1]$ onto $[0, 2]$ are:

Choose the correct answers from the given four options:
The derivative of $\cos^{-1}(2\text{x}^2-1)$ w.r.t. $\cos^{-1}\text{x}$ is:

$2$
$\frac{-1}{2\sqrt{1-\text{x}^2}}$
$\frac{2}{\text{x}}$
$1-\text{x}^2$

Given that $A^{-1}=\frac{1}{7}\left[\begin{array}{cc}2 & 1 \\ -3 & 2\end{array}\right]$, matrix $A$ is :

A and B are two events such that P(A / B) =P(B/A). $\neq 0$ then which of the following is correct-

Let R be a relation on N defined by x + 2y = 8. The domain of R is:

{2, 4, 8}
{2, 4, 6, 8}
{2, 4, 6}
{1, 2, 3, 4}

Let $f(x) = x^2 – x + 1, \text{x}\geq\frac{1}{2},$ then the solution of the equation $f(x) = f^{-1}(x)$ is: