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

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


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

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

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

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