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

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


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

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

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

Multiply (-1 + l) * (9 + l)
72 = l(-1(9 + l) + l(9 + l))
72 = l((9 * -1 + l * -1) + l(9 + l))
72 = l((-9 + -1l) + l(9 + l))
72 = l(-9 + -1l + (9 * l + l * l))
72 = l(-9 + -1l + (9l + l2))

Combine like terms: -1l + 9l = 8l
72 = l(-9 + 8l + l2)
72 = (-9 * l + 8l * l + l2 * l)
72 = (-9l + 8l2 + l3)

Solving
72 = -9l + 8l2 + l3

Solving for variable 'l'.

Reorder the terms:
72 + 9l + -8l2 + -1l3 = -9l + 9l + 8l2 + -8l2 + l3 + -1l3

Combine like terms: -9l + 9l = 0
72 + 9l + -8l2 + -1l3 = 0 + 8l2 + -8l2 + l3 + -1l3
72 + 9l + -8l2 + -1l3 = 8l2 + -8l2 + l3 + -1l3

Combine like terms: 8l2 + -8l2 = 0
72 + 9l + -8l2 + -1l3 = 0 + l3 + -1l3
72 + 9l + -8l2 + -1l3 = l3 + -1l3

Combine like terms: l3 + -1l3 = 0
72 + 9l + -8l2 + -1l3 = 0

The solution to this equation could not be determined.

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