Find f(x) if f'(x) = x^2 -5x -3 and f(0) = -2
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We are given f'(x) = x^2 - 5x - 3 and f(0) = -2
To find f(x) we have to integrate f'(x)
Int [ f'(x)] = Int [ x^2 - 5x - 3]
=> f(x) = x^3 / 3 - (5/2)x^2 - 3x + C
f(0) = 0 + 0 + 0 + C = -2
=> C = -2
f(x) = x^3/ 3 - (5/2)x^2 - 3x - 2
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calendarEducator since 2008
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f'(x) = x^2 -5x -3
We need to find f(x).
We know that f(x) = integral of f'(x).
==> f(x) = Int ( x^2 -5x -3) dx
= Int (x^2) dx - Int (5x) dx - Int 3 dx
= x^3/3 - 5x^2/2 - 3x + C
==> f(x)= (1/3)x^3 -(5/2)x^2 - 3x + C
But we are given that f(0) = -2
==> f(0) = 0 - 0 - 0 + C = -2
==> C = -2
==> f(x) = (1/3)x^3 - (5/2)x^2 - 3x -2