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Matrices and Determinants question

2023 · 6 Apr · Shift 1 · Q28

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JEE Main
Mathematics
Matrices and Determinants
2023 · 6 Apr · Shift 1 · Q28

Matrices and Determinants question

2023 · 6 Apr · Shift 1 · Q28

JEE MainMathematicsMatrices and DeterminantsMCQ+4 / −1

Let

\mathrm{A}=\left[\mathrm{a}_{\mathrm{ij}}\right]_{2 \times 2}

, where

\mathrm{a}_{\mathrm{ij}} eq 0

for all

\mathrm{i}, \mathrm{j}

and

\mathrm{A}^{2}=\mathrm{I}

. Let a be the sum of all diagonal elements of

\mathrm{A}

and

\mathrm{b}=|\mathrm{A}|

. Then

3 a^{2}+4 b^{2}

is equal to :

A
4
B
3
C
14
D
7

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