y=-5(x-4)(x-9)

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Solution for y=-5(x-4)(x-9) equation: 


Simplifying
y = -5(x + -4)(x + -9)

Reorder the terms:
y = -5(-4 + x)(x + -9)

Reorder the terms:
y = -5(-4 + x)(-9 + x)

Multiply (-4 + x) * (-9 + x)
y = -5(-4(-9 + x) + x(-9 + x))
y = -5((-9 * -4 + x * -4) + x(-9 + x))
y = -5((36 + -4x) + x(-9 + x))
y = -5(36 + -4x + (-9 * x + x * x))
y = -5(36 + -4x + (-9x + x2))

Combine like terms: -4x + -9x = -13x
y = -5(36 + -13x + x2)
y = (36 * -5 + -13x * -5 + x2 * -5)
y = (-180 + 65x + -5x2)

Solving
y = -180 + 65x + -5x2

Solving for variable 'y'.

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

Simplifying
y = -180 + 65x + -5x2

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