x^2=-13x-40

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Solution for x^2=-13x-40 equation:


Simplifying
x2 = -13x + -40

Reorder the terms:
x2 = -40 + -13x

Solving
x2 = -40 + -13x

Solving for variable 'x'.

Reorder the terms:
40 + 13x + x2 = -40 + -13x + 40 + 13x

Reorder the terms:
40 + 13x + x2 = -40 + 40 + -13x + 13x

Combine like terms: -40 + 40 = 0
40 + 13x + x2 = 0 + -13x + 13x
40 + 13x + x2 = -13x + 13x

Combine like terms: -13x + 13x = 0
40 + 13x + x2 = 0

Factor a trinomial.
(8 + x)(5 + x) = 0

Subproblem 1

Set the factor '(8 + x)' equal to zero and attempt to solve: Simplifying 8 + x = 0 Solving 8 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + x = 0 + -8 x = 0 + -8 Combine like terms: 0 + -8 = -8 x = -8 Simplifying x = -8

Subproblem 2

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

Solution

x = {-8, -5}

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