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Find the intervals in which the function f(x) = (3/2)x^4 - 4x^3 - 45x^2 + 51 is :

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Find the intervals in which the function f(x) = (3/2)x4 - 4x3 - 45x2 + 51 is :

(i) strictly increasing 

(ii) strictly decreasing

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1 Answer

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Best answer

f(x) = 6x3 -12x2 - 90x

= 6x(x - 5)(x + 3)

Equating f'(x) = 0

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