y=(x^2+3x-4)(x-9)

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Solution for y=(x^2+3x-4)(x-9) equation: 


Simplifying
y = (x2 + 3x + -4)(x + -9)

Reorder the terms:
y = (-4 + 3x + x2)(x + -9)

Reorder the terms:
y = (-4 + 3x + x2)(-9 + x)

Multiply (-4 + 3x + x2) * (-9 + x)
y = (-4(-9 + x) + 3x * (-9 + x) + x2(-9 + x))
y = ((-9 * -4 + x * -4) + 3x * (-9 + x) + x2(-9 + x))
y = ((36 + -4x) + 3x * (-9 + x) + x2(-9 + x))
y = (36 + -4x + (-9 * 3x + x * 3x) + x2(-9 + x))
y = (36 + -4x + (-27x + 3x2) + x2(-9 + x))
y = (36 + -4x + -27x + 3x2 + (-9 * x2 + x * x2))
y = (36 + -4x + -27x + 3x2 + (-9x2 + x3))

Combine like terms: -4x + -27x = -31x
y = (36 + -31x + 3x2 + -9x2 + x3)

Combine like terms: 3x2 + -9x2 = -6x2
y = (36 + -31x + -6x2 + x3)

Solving
y = 36 + -31x + -6x2 + x3

Solving for variable 'y'.

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

Simplifying
y = 36 + -31x + -6x2 + x3

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