f(x)=X^2+21x+108

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Solution for f(x)=X^2+21x+108 equation: 


Simplifying
f(x) = X2 + 21x + 108

Multiply f * x
fx = X2 + 21x + 108

Reorder the terms:
fx = 108 + X2 + 21x

Solving
fx = 108 + X2 + 21x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 108x-1 + x-1X2 + 21

Simplifying
f = 108x-1 + x-1X2 + 21

Reorder the terms:
f = 21 + 108x-1 + x-1X2

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