f(x)=-2x(x+2)

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Solution for f(x)=-2x(x+2) equation: 


Simplifying
f(x) = -2x(x + 2)

Multiply f * x
fx = -2x(x + 2)

Reorder the terms:
fx = -2x(2 + x)
fx = (2 * -2x + x * -2x)
fx = (-4x + -2x2)

Solving
fx = -4x + -2x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -4 + -2x

Simplifying
f = -4 + -2x

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