x^2=5x+84

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Solution for x^2=5x+84 equation:


Simplifying
x2 = 5x + 84

Reorder the terms:
x2 = 84 + 5x

Solving
x2 = 84 + 5x

Solving for variable 'x'.

Reorder the terms:
-84 + -5x + x2 = 84 + 5x + -84 + -5x

Reorder the terms:
-84 + -5x + x2 = 84 + -84 + 5x + -5x

Combine like terms: 84 + -84 = 0
-84 + -5x + x2 = 0 + 5x + -5x
-84 + -5x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-84 + -5x + x2 = 0

Factor a trinomial.
(-7 + -1x)(12 + -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 '(12 + -1x)' equal to zero and attempt to solve: Simplifying 12 + -1x = 0 Solving 12 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -1x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 0 + -12 -1x = 0 + -12 Combine like terms: 0 + -12 = -12 -1x = -12 Divide each side by '-1'. x = 12 Simplifying x = 12

Solution

x = {-7, 12}

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