If $f\;\left( x \right) = {x^2} + 4x - 5\;{\rm{and\;}}A = \left[ {\begin{array}{*{20}{c}} {1\;\;\,\,\,\;2}\\ {4\;\,\, - 3} \end{array}} \right]$, then $f\;\left( A \right)$ is equal to

$\left[ {\begin{array}{*{20}{c}} {0\;\,\,\, - 4}\\ {8\;\;\;\;\;\;8} \end{array}} \right]$

$\left[ {\begin{array}{*{20}{c}} 2&1\\ 2&0 \end{array}} \right]$

$\left[ {\begin{array}{*{20}{c}} 1&1\\ 1&0 \end{array}} \right]$

JEE MATHEMATICS MCQ: MATRICES

1 Easy

1 of 1

Application +4 | -1

f\;\left( x \right) = {x^2} + 4x - 5\;\mathrm{and\;}A = \left[ {\begin{array}{cccccccccccccccccccc} {1\;\;\,\,\,\;2}\\ {4\;\,\, - 3} \end{array}} \right]

, then

f\;\left( A \right)

is equal to

View answer and explanation

Correct option: D

\left[ {\begin{array}{cccccccccccccccccccc} 8&4\\ 8&0 \end{array}} \right]

Option D (

\left[ {\begin{{array}}{{{*{20}{c}}}} 8&4\\ 8&0 \end{{array}}} \right]

) is correct because it is the result of substituting matrix A into the given polynomial function and performing the matrix operations.

Practice All Chapter MCQs →

\left|\begin{array}{ccc}a & b-c & b+c \\ c+a & b & c-a \\ a-b & a+b & c\end{array}\right|=0

a, b, c

a x+b y+c=0

{x_2} - {x_3} = 1,\; - {x_1} + 2{x_3} = - 2,\;{x_1} - 2,\;{x_1} - 2{x_2} = 3

2x + 3y + 1 = 0,3x + y - 2 = 0

ax + 2y - b = 0

\left|\begin{array}{ccc}1 & \left(\alpha^{2 x}-\alpha^{-2 x}\right)^2 & \left(\alpha^{2 x}+\alpha^{-2 x}\right)^2 \\ 1 & \left(\beta^{2 x}-\beta^{-2 x}\right)^2 & \left(\beta^{2 x}+\beta^{-2 x}\right)^2 \\ 1 & \left(\gamma^{2 x}-\gamma^{-2 x}\right)^2 & \left(\gamma^{2 x}+\gamma^{-2 x}\right)^2\end{array}\right|

\omega

\left| {\begin{array}{cccccccccccccccccccc} 1&\omega &{{\omega ^2}}\\ \omega &{{\omega ^2}}&1\\ {{\omega ^2}}&1&\omega \end{array}} \right|

A

2 \times 2

A(\operatorname{adj} A)=\left[\begin{array}{cc}10 & 0 \\ 0 & 10\end{array}\right]

|A|