1
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Domain of $\cos ^{-1}\left[\log _5\left(x^2+7 x+15\right)\right]$ is

A

The set of all real numbers

B

$(-\infty,-5] \cup[-2, \infty)$

C

$R-\{-5,-2\}$, where $R$ is the set of real numbers

D

$[-5,-2]$

2
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Let $f(n)=A(-2)^n+B(-3)^n \forall A, B \in \mathbf{R}$ and $n \in \mathbf{N}-\{1,2\}$. If $f(n)+a f(n-1)+b f(n-2)=0$, then $(a+b)(b-a)=$

A

0

B

5

C

7

D

11

3
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $a$ and $b$ are any two real numbers, then

$$ \left|\begin{array}{ccc} 2 a-2 b-4 & 4 a & 4 a \\ 4 & 2-b-a & 4 \\ 2 b & 2 b & b-a-2 \end{array}\right|= $$

A

$4\left[(a+b)^3+8(a+b)^2+16(a+b)+8\right]$

B

$\frac{1}{2}(a+b+2)^3$

C

$2\left[(a+b)^3+6(a+b)^2+12(a+b)+8\right]$

D

$(a+b+2)^3$

4
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Let $A=\left[\begin{array}{ccc}2 & -2 & -4 \\ -1 & 3 & 4 \\ 1 & -2 & x\end{array}\right]$ and $A^2=A$. If $r$ is the rank of $A$, then $r+x=$

A

-3

B

2

C

1

D

-1

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