(c+5)(c-18)=0

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Solution for (c+5)(c-18)=0 equation:


Simplifying
(c + 5)(c + -18) = 0

Reorder the terms:
(5 + c)(c + -18) = 0

Reorder the terms:
(5 + c)(-18 + c) = 0

Multiply (5 + c) * (-18 + c)
(5(-18 + c) + c(-18 + c)) = 0
((-18 * 5 + c * 5) + c(-18 + c)) = 0
((-90 + 5c) + c(-18 + c)) = 0
(-90 + 5c + (-18 * c + c * c)) = 0
(-90 + 5c + (-18c + c2)) = 0

Combine like terms: 5c + -18c = -13c
(-90 + -13c + c2) = 0

Solving
-90 + -13c + c2 = 0

Solving for variable 'c'.

Factor a trinomial.
(-5 + -1c)(18 + -1c) = 0

Subproblem 1

Set the factor '(-5 + -1c)' equal to zero and attempt to solve: Simplifying -5 + -1c = 0 Solving -5 + -1c = 0 Move all terms containing c to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1c = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1c = 0 + 5 -1c = 0 + 5 Combine like terms: 0 + 5 = 5 -1c = 5 Divide each side by '-1'. c = -5 Simplifying c = -5

Subproblem 2

Set the factor '(18 + -1c)' equal to zero and attempt to solve: Simplifying 18 + -1c = 0 Solving 18 + -1c = 0 Move all terms containing c to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -1c = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1c = 0 + -18 -1c = 0 + -18 Combine like terms: 0 + -18 = -18 -1c = -18 Divide each side by '-1'. c = 18 Simplifying c = 18

Solution

c = {-5, 18}

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