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

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


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

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

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

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