f(x)=-3x(x+13)

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Solution for f(x)=-3x(x+13) equation: 


Simplifying
f(x) = -3x(x + 13)

Multiply f * x
fx = -3x(x + 13)

Reorder the terms:
fx = -3x(13 + x)
fx = (13 * -3x + x * -3x)
fx = (-39x + -3x2)

Solving
fx = -39x + -3x2

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f = -39 + -3x

Simplifying
f = -39 + -3x

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