15=x^2+6x+8

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Solution for 15=x^2+6x+8 equation:


Simplifying
15 = x2 + 6x + 8

Reorder the terms:
15 = 8 + 6x + x2

Solving
15 = 8 + 6x + x2

Solving for variable 'x'.

Combine like terms: 15 + -8 = 7
7 + -6x + -1x2 = 8 + 6x + x2 + -8 + -6x + -1x2

Reorder the terms:
7 + -6x + -1x2 = 8 + -8 + 6x + -6x + x2 + -1x2

Combine like terms: 8 + -8 = 0
7 + -6x + -1x2 = 0 + 6x + -6x + x2 + -1x2
7 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
7 + -6x + -1x2 = 0 + x2 + -1x2
7 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
7 + -6x + -1x2 = 0

Factor a trinomial.
(1 + -1x)(7 + x) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(7 + x)' equal to zero and attempt to solve: Simplifying 7 + x = 0 Solving 7 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + x = 0 + -7 x = 0 + -7 Combine like terms: 0 + -7 = -7 x = -7 Simplifying x = -7

Solution

x = {1, -7}

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