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

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


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

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

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

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

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