x^2+9x=8x+56

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Solution for x^2+9x=8x+56 equation:


Simplifying
x2 + 9x = 8x + 56

Reorder the terms:
9x + x2 = 8x + 56

Reorder the terms:
9x + x2 = 56 + 8x

Solving
9x + x2 = 56 + 8x

Solving for variable 'x'.

Reorder the terms:
-56 + 9x + -8x + x2 = 56 + 8x + -56 + -8x

Combine like terms: 9x + -8x = 1x
-56 + 1x + x2 = 56 + 8x + -56 + -8x

Reorder the terms:
-56 + 1x + x2 = 56 + -56 + 8x + -8x

Combine like terms: 56 + -56 = 0
-56 + 1x + x2 = 0 + 8x + -8x
-56 + 1x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
-56 + 1x + x2 = 0

Factor a trinomial.
(-8 + -1x)(7 + -1x) = 0

Subproblem 1

Set the factor '(-8 + -1x)' equal to zero and attempt to solve: Simplifying -8 + -1x = 0 Solving -8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -1x = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -1x = 0 + 8 -1x = 0 + 8 Combine like terms: 0 + 8 = 8 -1x = 8 Divide each side by '-1'. x = -8 Simplifying x = -8

Subproblem 2

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

Solution

x = {-8, 7}

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