f(x)=x^4-3x^3+21x^2

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Solution for f(x)=x^4-3x^3+21x^2 equation: 


Simplifying
f(x) = x4 + -3x3 + 21x2

Multiply f * x
fx = x4 + -3x3 + 21x2

Reorder the terms:
fx = 21x2 + -3x3 + x4

Solving
fx = 21x2 + -3x3 + x4

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 21x + -3x2 + x3

Simplifying
f = 21x + -3x2 + x3

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