x^2=20x-91

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Solution for x^2=20x-91 equation:


Simplifying
x2 = 20x + -91

Reorder the terms:
x2 = -91 + 20x

Solving
x2 = -91 + 20x

Solving for variable 'x'.

Reorder the terms:
91 + -20x + x2 = -91 + 20x + 91 + -20x

Reorder the terms:
91 + -20x + x2 = -91 + 91 + 20x + -20x

Combine like terms: -91 + 91 = 0
91 + -20x + x2 = 0 + 20x + -20x
91 + -20x + x2 = 20x + -20x

Combine like terms: 20x + -20x = 0
91 + -20x + x2 = 0

Factor a trinomial.
(7 + -1x)(13 + -1x) = 0

Subproblem 1

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 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 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Subproblem 2

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

Solution

x = {7, 13}

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