-x^2+8x=-65

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Solution for -x^2+8x=-65 equation:


Simplifying
-1x2 + 8x = -65

Reorder the terms:
8x + -1x2 = -65

Solving
8x + -1x2 = -65

Solving for variable 'x'.

Reorder the terms:
65 + 8x + -1x2 = -65 + 65

Combine like terms: -65 + 65 = 0
65 + 8x + -1x2 = 0

Factor a trinomial.
(13 + -1x)(5 + x) = 0

Subproblem 1

Set the factor '(13 + -1x)' equal to zero and attempt to solve: Simplifying 13 + -1x = 0 Solving 13 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -1x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -1x = 0 + -13 -1x = 0 + -13 Combine like terms: 0 + -13 = -13 -1x = -13 Divide each side by '-1'. x = 13 Simplifying x = 13

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 = {13, -5}

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