y=3(x-1)(x-9)

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Solution for y=3(x-1)(x-9) equation: 


Simplifying
y = 3(x + -1)(x + -9)

Reorder the terms:
y = 3(-1 + x)(x + -9)

Reorder the terms:
y = 3(-1 + x)(-9 + x)

Multiply (-1 + x) * (-9 + x)
y = 3(-1(-9 + x) + x(-9 + x))
y = 3((-9 * -1 + x * -1) + x(-9 + x))
y = 3((9 + -1x) + x(-9 + x))
y = 3(9 + -1x + (-9 * x + x * x))
y = 3(9 + -1x + (-9x + x2))

Combine like terms: -1x + -9x = -10x
y = 3(9 + -10x + x2)
y = (9 * 3 + -10x * 3 + x2 * 3)
y = (27 + -30x + 3x2)

Solving
y = 27 + -30x + 3x2

Solving for variable 'y'.

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

Simplifying
y = 27 + -30x + 3x2

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