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

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


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

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

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

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

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

Solving
y = -4 + 3x + x2

Solving for variable 'y'.

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

Simplifying
y = -4 + 3x + x2

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