72=x(x-1)(x+9)

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Solution for 72=x(x-1)(x+9) equation: 


Simplifying
72 = x(x + -1)(x + 9)

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

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

Multiply (-1 + x) * (9 + x)
72 = x(-1(9 + x) + x(9 + x))
72 = x((9 * -1 + x * -1) + x(9 + x))
72 = x((-9 + -1x) + x(9 + x))
72 = x(-9 + -1x + (9 * x + x * x))
72 = x(-9 + -1x + (9x + x2))

Combine like terms: -1x + 9x = 8x
72 = x(-9 + 8x + x2)
72 = (-9 * x + 8x * x + x2 * x)
72 = (-9x + 8x2 + x3)

Solving
72 = -9x + 8x2 + x3

Solving for variable 'x'.

Reorder the terms:
72 + 9x + -8x2 + -1x3 = -9x + 9x + 8x2 + -8x2 + x3 + -1x3

Combine like terms: -9x + 9x = 0
72 + 9x + -8x2 + -1x3 = 0 + 8x2 + -8x2 + x3 + -1x3
72 + 9x + -8x2 + -1x3 = 8x2 + -8x2 + x3 + -1x3

Combine like terms: 8x2 + -8x2 = 0
72 + 9x + -8x2 + -1x3 = 0 + x3 + -1x3
72 + 9x + -8x2 + -1x3 = x3 + -1x3

Combine like terms: x3 + -1x3 = 0
72 + 9x + -8x2 + -1x3 = 0

The solution to this equation could not be determined.

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