18x-9=x^2+8x

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Solution for 18x-9=x^2+8x equation:


Simplifying
18x + -9 = x2 + 8x

Reorder the terms:
-9 + 18x = x2 + 8x

Reorder the terms:
-9 + 18x = 8x + x2

Solving
-9 + 18x = 8x + x2

Solving for variable 'x'.

Combine like terms: 18x + -8x = 10x
-9 + 10x + -1x2 = 8x + x2 + -8x + -1x2

Reorder the terms:
-9 + 10x + -1x2 = 8x + -8x + x2 + -1x2

Combine like terms: 8x + -8x = 0
-9 + 10x + -1x2 = 0 + x2 + -1x2
-9 + 10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-9 + 10x + -1x2 = 0

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

Subproblem 1

Set the factor '(-9 + x)' equal to zero and attempt to solve: Simplifying -9 + x = 0 Solving -9 + x = 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 + x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + x = 0 + 9 x = 0 + 9 Combine like terms: 0 + 9 = 9 x = 9 Simplifying x = 9

Subproblem 2

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

Solution

x = {9, 1}

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