f(4)=2x^3+3x^2-39x-20

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Solution for f(4)=2x^3+3x^2-39x-20 equation: 


Simplifying
f(4) = 2x3 + 3x2 + -39x + -20

Reorder the terms for easier multiplication:
4f = 2x3 + 3x2 + -39x + -20

Reorder the terms:
4f = -20 + -39x + 3x2 + 2x3

Solving
4f = -20 + -39x + 3x2 + 2x3

Solving for variable 'f'.

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

Divide each side by '4'.
f = -5 + -9.75x + 0.75x2 + 0.5x3

Simplifying
f = -5 + -9.75x + 0.75x2 + 0.5x3

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