1
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

If $$A=\left[\begin{array}{cc}2 & -3 \\ -4 & 1\end{array}\right]$$, then $$\left(A^T\right)^2+(12 A)^T=$$

A
$$5\left[\begin{array}{cc}8 & 12 \\ -9 & 5\end{array}\right]$$
B
$$5\left[\begin{array}{cc}8 & -9 \\ -12 & 5\end{array}\right]$$
C
$$\left[\begin{array}{cc}40 & -45 \\ 60 & 25\end{array}\right]$$
D
$$\left[\begin{array}{cc}40 & -60 \\ -45 & 25\end{array}\right]$$
2
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

If $$a, b, c$$ are respectively the 5 th, 8 th, 13 th terms of an arithmetic progression, then $$\left|\begin{array}{ccc}a & 5 & 1 \\ b & 8 & 1 \\ c & 13 & 1\end{array}\right|=$$

A
0
B
1
C
abc
D
520
3
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

If $$A=\left[\begin{array}{ccc}1 & 0 & 0 \\ a & -1 & 0 \\ b & c & 1\end{array}\right]$$ is such that $$A^2=I$$, then

A
$$b=\frac{a c}{2}$$
B
$$b=-\frac{a c}{2}$$
C
$$b=\frac{a+c}{2}$$
D
$$b=\sqrt{a c}$$
4
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

Let $$A=\left[\begin{array}{ccc}-2 & x & 1 \\ x & 1 & 1 \\ 2 & 3 & -1\end{array}\right]$$. If the roots of the equation $$\operatorname{det} A=0$$ are $$l, m$$ then $$l^3-m^3=$$

A
35
B
$$-$$35
C
19
D
$$-$$19
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