find f(x) if  f'(x) = 3x^2 - 5x + 3

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f'(x) 3x^2 - 5x+ 3

f(x) = integral f'(x).

==> f(x) = intg (3x^2 - 5x + 3) dx

                = intg (3x^2)dx - intg (5x) dx + intg 3 dx

                 = 3x^3/3 - 5x^2 /2  + 3x + C

==> f(x) = x^3 - (5/2)x^2 + 3x + C

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