y=-(x+2)(x-4)

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Solution for y=-(x+2)(x-4) equation: 


Simplifying
y = -1(x + 2)(x + -4)

Reorder the terms:
y = -1(2 + x)(x + -4)

Reorder the terms:
y = -1(2 + x)(-4 + x)

Multiply (2 + x) * (-4 + x)
y = -1(2(-4 + x) + x(-4 + x))
y = -1((-4 * 2 + x * 2) + x(-4 + x))
y = -1((-8 + 2x) + x(-4 + x))
y = -1(-8 + 2x + (-4 * x + x * x))
y = -1(-8 + 2x + (-4x + x2))

Combine like terms: 2x + -4x = -2x
y = -1(-8 + -2x + x2)
y = (-8 * -1 + -2x * -1 + x2 * -1)
y = (8 + 2x + -1x2)

Solving
y = 8 + 2x + -1x2

Solving for variable 'y'.

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

Simplifying
y = 8 + 2x + -1x2

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