f(x)=x(x+3)

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


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

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

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

Solving
fx = 3x + x2

Solving for variable 'f'.

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

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

Simplifying
f = 3 + x

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