Q.
If the area enclosed by curve y=f(x) and y=x2+2 between the abscissa x=2 and x=α,α>2, is α3−4α2+8 sq. unit. It is known that curve y=f(x) lies below the parabola y=x2+2
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a
1
b
2
c
3
d
4
answer is A.
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Detailed Solution
According to the question,α3−4α2+8=∫2α x2+2−f(x)dx Differentiating w.r.t. α on both sides, we get 3α2−8α=α2+2−f(α)∴ f(x)=−2x2+8x+2
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