f-1(x)=9x^2-90x+18

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Solution for f-1(x)=9x^2-90x+18 equation: 


Simplifying
f + -1(x) = 9x2 + -90x + 18

Reorder the terms:
f + -1x = 18 + -90x + 9x2

Solving
f + -1x = 18 + -90x + 9x2

Solving for variable 'f'.

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

Add 'x' to each side of the equation.
f + -1x + x = 18 + -90x + x + 9x2

Combine like terms: -1x + x = 0
f + 0 = 18 + -90x + x + 9x2
f = 18 + -90x + x + 9x2

Combine like terms: -90x + x = -89x
f = 18 + -89x + 9x2

Simplifying
f = 18 + -89x + 9x2

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