y=3(x-9)(x+2)

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Solution for y=3(x-9)(x+2) equation: 


Simplifying
y = 3(x + -9)(x + 2)

Reorder the terms:
y = 3(-9 + x)(x + 2)

Reorder the terms:
y = 3(-9 + x)(2 + x)

Multiply (-9 + x) * (2 + x)
y = 3(-9(2 + x) + x(2 + x))
y = 3((2 * -9 + x * -9) + x(2 + x))
y = 3((-18 + -9x) + x(2 + x))
y = 3(-18 + -9x + (2 * x + x * x))
y = 3(-18 + -9x + (2x + x2))

Combine like terms: -9x + 2x = -7x
y = 3(-18 + -7x + x2)
y = (-18 * 3 + -7x * 3 + x2 * 3)
y = (-54 + -21x + 3x2)

Solving
y = -54 + -21x + 3x2

Solving for variable 'y'.

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

Simplifying
y = -54 + -21x + 3x2

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