y=3(x+1)(x-4)

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Solution for y=3(x+1)(x-4) equation: 


Simplifying
y = 3(x + 1)(x + -4)

Reorder the terms:
y = 3(1 + x)(x + -4)

Reorder the terms:
y = 3(1 + x)(-4 + x)

Multiply (1 + x) * (-4 + x)
y = 3(1(-4 + x) + x(-4 + x))
y = 3((-4 * 1 + x * 1) + x(-4 + x))
y = 3((-4 + 1x) + x(-4 + x))
y = 3(-4 + 1x + (-4 * x + x * x))
y = 3(-4 + 1x + (-4x + x2))

Combine like terms: 1x + -4x = -3x
y = 3(-4 + -3x + x2)
y = (-4 * 3 + -3x * 3 + x2 * 3)
y = (-12 + -9x + 3x2)

Solving
y = -12 + -9x + 3x2

Solving for variable 'y'.

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

Simplifying
y = -12 + -9x + 3x2

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