y=81-(9-2x)(9-2x)

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Solution for y=81-(9-2x)(9-2x) equation: 


Simplifying
y = 81 + -1(9 + -2x)(9 + -2x)

Multiply (9 + -2x) * (9 + -2x)
y = 81 + -1(9(9 + -2x) + -2x * (9 + -2x))
y = 81 + -1((9 * 9 + -2x * 9) + -2x * (9 + -2x))
y = 81 + -1((81 + -18x) + -2x * (9 + -2x))
y = 81 + -1(81 + -18x + (9 * -2x + -2x * -2x))
y = 81 + -1(81 + -18x + (-18x + 4x2))

Combine like terms: -18x + -18x = -36x
y = 81 + -1(81 + -36x + 4x2)
y = 81 + (81 * -1 + -36x * -1 + 4x2 * -1)
y = 81 + (-81 + 36x + -4x2)

Combine like terms: 81 + -81 = 0
y = 0 + 36x + -4x2
y = 36x + -4x2

Solving
y = 36x + -4x2

Solving for variable 'y'.

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

Simplifying
y = 36x + -4x2

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