Let $P = \left[ {\begin{array}{*{20}{c}} 1&0&0\\ 3&1&0\\ 9&3&1 \end{array}} \right]{\rm{ }}\,\,{\rm{and}}\,\,{\rm{ }}Q = \left[ {{q_{ij}}} \right]{\rm{ }}\,\,{\rm{be}}\,\,{\rm{ two }}\,\,3 \times 3$ matrices such that $Q - {P^5} = {I_3}.$ Then, $\frac{{{q_{21}} + {q_{31}}}}{{{q_{32}}}}$ is equal to

JEE MATHEMATICS MCQ: MATRICES

1 Easy

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Application +4 | -1

Let

P = \left[ {\begin{array}{cccccccccccccccccccc} 1&0&0\\ 3&1&0\\ 9&3&1 \end{array}} \right]\mathrm{ }\,\,\mathrm{and}\,\,\mathrm{ }Q = \left[ {{q_{ij}}} \right]\mathrm{ }\,\,\mathrm{be}\,\,\mathrm{ two }\,\,3 \times 3

matrices such that

Q - {P^5} = {I_3}.

Then,

\frac{{{q_{21}} + {q_{31}}}}{{{q_{32}}}}

is equal to

View answer and explanation

Correct option: A

Option A (10) is correct. After calculating P⁵ and then Q, the value of (q_{21} + q_{31})/q_{32} is found to be 10.

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\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|