0=x^2+13x+40

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Solution for 0=x^2+13x+40 equation:


Simplifying
0 = x2 + 13x + 40

Reorder the terms:
0 = 40 + 13x + x2

Solving
0 = 40 + 13x + x2

Solving for variable 'x'.

Combine like terms: 0 + -40 = -40
-40 + -13x + -1x2 = 40 + 13x + x2 + -40 + -13x + -1x2

Reorder the terms:
-40 + -13x + -1x2 = 40 + -40 + 13x + -13x + x2 + -1x2

Combine like terms: 40 + -40 = 0
-40 + -13x + -1x2 = 0 + 13x + -13x + x2 + -1x2
-40 + -13x + -1x2 = 13x + -13x + x2 + -1x2

Combine like terms: 13x + -13x = 0
-40 + -13x + -1x2 = 0 + x2 + -1x2
-40 + -13x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-40 + -13x + -1x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(40 + 13x + x2) = 0

Factor a trinomial.
-1((8 + x)(5 + x)) = 0

Ignore the factor -1.

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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