jee-main 2016 Q63

jee-main · India · 03apr Matrices Determinant and Rank Computation

If $A = \begin{pmatrix} 5a & -b \\ 3 & 2 \end{pmatrix}$ and $A$ adj $A = A A^{T}$, then $5a + b$ is equal to: (1) $-1$ (2) $5$ (3) $4$ (4) $13$

If $A = \begin{pmatrix} 5a & -b \\ 3 & 2 \end{pmatrix}$ and $A$ adj $A = A A^{T}$, then $5a + b$ is equal to:
(1) $-1$
(2) $5$
(3) $4$
(4) $13$