x^2-x-20=9x+4

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Solution for x^2-x-20=9x+4 equation:


Simplifying
x2 + -1x + -20 = 9x + 4

Reorder the terms:
-20 + -1x + x2 = 9x + 4

Reorder the terms:
-20 + -1x + x2 = 4 + 9x

Solving
-20 + -1x + x2 = 4 + 9x

Solving for variable 'x'.

Reorder the terms:
-20 + -4 + -1x + -9x + x2 = 4 + 9x + -4 + -9x

Combine like terms: -20 + -4 = -24
-24 + -1x + -9x + x2 = 4 + 9x + -4 + -9x

Combine like terms: -1x + -9x = -10x
-24 + -10x + x2 = 4 + 9x + -4 + -9x

Reorder the terms:
-24 + -10x + x2 = 4 + -4 + 9x + -9x

Combine like terms: 4 + -4 = 0
-24 + -10x + x2 = 0 + 9x + -9x
-24 + -10x + x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-24 + -10x + x2 = 0

Factor a trinomial.
(-2 + -1x)(12 + -1x) = 0

Subproblem 1

Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2

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 = {-2, 12}

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