y=3(x+1)(x-7)

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Solution for y=3(x+1)(x-7) equation: 


Simplifying
y = 3(x + 1)(x + -7)

Reorder the terms:
y = 3(1 + x)(x + -7)

Reorder the terms:
y = 3(1 + x)(-7 + x)

Multiply (1 + x) * (-7 + x)
y = 3(1(-7 + x) + x(-7 + x))
y = 3((-7 * 1 + x * 1) + x(-7 + x))
y = 3((-7 + 1x) + x(-7 + x))
y = 3(-7 + 1x + (-7 * x + x * x))
y = 3(-7 + 1x + (-7x + x2))

Combine like terms: 1x + -7x = -6x
y = 3(-7 + -6x + x2)
y = (-7 * 3 + -6x * 3 + x2 * 3)
y = (-21 + -18x + 3x2)

Solving
y = -21 + -18x + 3x2

Solving for variable 'y'.

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

Simplifying
y = -21 + -18x + 3x2

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