f(x)=5y-2(7y^2+4y-8)+9y^2

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Solution for f(x)=5y-2(7y^2+4y-8)+9y^2 equation: 


Simplifying
f(x) = 5y + -2(7y2 + 4y + -8) + 9y2

Multiply f * x
fx = 5y + -2(7y2 + 4y + -8) + 9y2

Reorder the terms:
fx = 5y + -2(-8 + 4y + 7y2) + 9y2
fx = 5y + (-8 * -2 + 4y * -2 + 7y2 * -2) + 9y2
fx = 5y + (16 + -8y + -14y2) + 9y2

Reorder the terms:
fx = 16 + 5y + -8y + -14y2 + 9y2

Combine like terms: 5y + -8y = -3y
fx = 16 + -3y + -14y2 + 9y2

Combine like terms: -14y2 + 9y2 = -5y2
fx = 16 + -3y + -5y2

Solving
fx = 16 + -3y + -5y2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 16x-1 + -3x-1y + -5x-1y2

Simplifying
f = 16x-1 + -3x-1y + -5x-1y2

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