f(80)=x(40-x)

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Solution for f(80)=x(40-x) equation: 


Simplifying
f(80) = x(40 + -1x)

Reorder the terms for easier multiplication:
80f = x(40 + -1x)
80f = (40 * x + -1x * x)
80f = (40x + -1x2)

Solving
80f = 40x + -1x2

Solving for variable 'f'.

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

Divide each side by '80'.
f = 0.5x + -0.0125x2

Simplifying
f = 0.5x + -0.0125x2

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