1
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $$g(x)=\frac{1}{6} f\left(3 x^2-1\right)+\frac{1}{2} f\left(1-x^2\right), \forall x \in R$$, where $$f^{\prime \prime}(x) > 0, \forall x \in R$$. Then, $$g(x)$$ is increasing in the interval

A
$$\left(\frac{-1}{\sqrt{2}}, 0\right) \cup\left(\frac{1}{\sqrt{2}}, \infty\right)$$
B
$$\left(\frac{-1}{\sqrt{2}}, \frac{1}{\sqrt{2}}\right)$$
C
$$(-1,0) \cup(1,2)$$
D
$$\left(-\infty, \frac{-1}{\sqrt{2}}\right) \cup\left(\frac{1}{\sqrt{2}}, \infty\right)$$
2
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the function $$f(x)=2 x^3-9 a x^2+12 a^2 x+1$$ attains its maximum and minimum at $$p$$ and $$q$$ respectively, such that $$p^2=q$$, then $$a$$ equals

A
0
B
1
C
2
D
$$-$$1
3
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $$y=4 x-6$$ is a tangent to the curve $$y^2=a x^4+b$$ at $$(3,6)$$, then the values of $$a$$ and $$b$$ are

A
$$a=\frac{4}{9}$$ and $$b=\frac{-4}{9}$$
B
$$a=0$$ and $$b=\frac{4}{9}$$
C
$$a=\frac{-4}{9}$$ and $$b=\frac{-4}{9}$$
D
$$a=\frac{4}{9}$$ and $$b=0$$
4
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Find the positive value of $$a$$ for which the equality $$2 \alpha+\beta=8$$ holds, where $$\alpha$$ and $$\beta$$ are the points of maximum and minimum, respectively, of the function $$f(x)=2 x^3-9 a x^2+12 a^2 x+1$$.

A
0
B
2
C
1
D
$$\frac{1}{4}$$

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