x^2+3x=8x+36

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Solution for x^2+3x=8x+36 equation:


Simplifying
x2 + 3x = 8x + 36

Reorder the terms:
3x + x2 = 8x + 36

Reorder the terms:
3x + x2 = 36 + 8x

Solving
3x + x2 = 36 + 8x

Solving for variable 'x'.

Reorder the terms:
-36 + 3x + -8x + x2 = 36 + 8x + -36 + -8x

Combine like terms: 3x + -8x = -5x
-36 + -5x + x2 = 36 + 8x + -36 + -8x

Reorder the terms:
-36 + -5x + x2 = 36 + -36 + 8x + -8x

Combine like terms: 36 + -36 = 0
-36 + -5x + x2 = 0 + 8x + -8x
-36 + -5x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
-36 + -5x + x2 = 0

Factor a trinomial.
(-4 + -1x)(9 + -1x) = 0

Subproblem 1

Set the factor '(-4 + -1x)' equal to zero and attempt to solve: Simplifying -4 + -1x = 0 Solving -4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1x = 0 + 4 -1x = 0 + 4 Combine like terms: 0 + 4 = 4 -1x = 4 Divide each side by '-1'. x = -4 Simplifying x = -4

Subproblem 2

Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9

Solution

x = {-4, 9}

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