a^2-18a=-72

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Solution for a^2-18a=-72 equation:


Simplifying
a2 + -18a = -72

Reorder the terms:
-18a + a2 = -72

Solving
-18a + a2 = -72

Solving for variable 'a'.

Reorder the terms:
72 + -18a + a2 = -72 + 72

Combine like terms: -72 + 72 = 0
72 + -18a + a2 = 0

Factor a trinomial.
(6 + -1a)(12 + -1a) = 0

Subproblem 1

Set the factor '(6 + -1a)' equal to zero and attempt to solve: Simplifying 6 + -1a = 0 Solving 6 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1a = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1a = 0 + -6 -1a = 0 + -6 Combine like terms: 0 + -6 = -6 -1a = -6 Divide each side by '-1'. a = 6 Simplifying a = 6

Subproblem 2

Set the factor '(12 + -1a)' equal to zero and attempt to solve: Simplifying 12 + -1a = 0 Solving 12 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -1a = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -1a = 0 + -12 -1a = 0 + -12 Combine like terms: 0 + -12 = -12 -1a = -12 Divide each side by '-1'. a = 12 Simplifying a = 12

Solution

a = {6, 12}

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