c^2+18c+81=0

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Solution for c^2+18c+81=0 equation:


Simplifying
c2 + 18c + 81 = 0

Reorder the terms:
81 + 18c + c2 = 0

Solving
81 + 18c + c2 = 0

Solving for variable 'c'.

Factor a trinomial.
(9 + c)(9 + c) = 0

Subproblem 1

Set the factor '(9 + c)' equal to zero and attempt to solve: Simplifying 9 + c = 0 Solving 9 + c = 0 Move all terms containing c to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + c = 0 + -9 Combine like terms: 9 + -9 = 0 0 + c = 0 + -9 c = 0 + -9 Combine like terms: 0 + -9 = -9 c = -9 Simplifying c = -9

Subproblem 2

Set the factor '(9 + c)' equal to zero and attempt to solve: Simplifying 9 + c = 0 Solving 9 + c = 0 Move all terms containing c to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + c = 0 + -9 Combine like terms: 9 + -9 = 0 0 + c = 0 + -9 c = 0 + -9 Combine like terms: 0 + -9 = -9 c = -9 Simplifying c = -9

Solution

c = {-9, -9}

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