You need to use the inverse of differentiation, hence you need to integrate the given function twice to find the original function f(x).

`int f''(x) dx = f'(x) + c`

`int (6 + 6x + 24x^2)dx = int 6dx + int 6x dx + int 24x^2 dx`

`int (6 + 6x + 24x^2)dx = 6x + 6x^2/2 + 24x^3/3 + c`

`int (6 + 6x + 24x^2)dx = 6x + 3x^2 + 8x^3 + c`

(The entire section contains 172 words.)

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