y=-(-x+4)(x-9)

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Solution for y=-(-x+4)(x-9) equation: 


Simplifying
y = -1(-1x + 4)(x + -9)

Reorder the terms:
y = -1(4 + -1x)(x + -9)

Reorder the terms:
y = -1(4 + -1x)(-9 + x)

Multiply (4 + -1x) * (-9 + x)
y = -1(4(-9 + x) + -1x * (-9 + x))
y = -1((-9 * 4 + x * 4) + -1x * (-9 + x))
y = -1((-36 + 4x) + -1x * (-9 + x))
y = -1(-36 + 4x + (-9 * -1x + x * -1x))
y = -1(-36 + 4x + (9x + -1x2))

Combine like terms: 4x + 9x = 13x
y = -1(-36 + 13x + -1x2)
y = (-36 * -1 + 13x * -1 + -1x2 * -1)
y = (36 + -13x + 1x2)

Solving
y = 36 + -13x + 1x2

Solving for variable 'y'.

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

Simplifying
y = 36 + -13x + 1x2

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