Tuesday, March 25, 2014

If f'(x) = 3x^2 - 6x +3, find f(x) if f(0) = 2

Given that f'(x) = 3x^2 - 6x +
3


We need to find the function
f(x).


But we know that f(x) = Integral
f'(x).


==> f(x) = Int (3x^2 - 6x + 3)
dx


==> f(x) = Int (3x^2) dx - Int 6x dx + Int 3
dx


==> f(x) = 3x^3/3 - 6x^2/2 + 3x +
C


Let us simplify.


==>
f(x) = x^3 - 3x^2 + 3x + C


But we know that f(0) =
2


==> f(0) = 0 - 0 + 0 + C =
2


==> C =
2


==> f(x) = x^3 - 3x^2 +3x + 2

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