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

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


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

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

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

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

Combine like terms: -4x + 9x = 5x
y = (36 + 5x + -1x2)

Solving
y = 36 + 5x + -1x2

Solving for variable 'y'.

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

Simplifying
y = 36 + 5x + -1x2

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