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

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


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

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

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

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