5x-9=x^2-18x+81

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Solution for 5x-9=x^2-18x+81 equation:


Simplifying
5x + -9 = x2 + -18x + 81

Reorder the terms:
-9 + 5x = x2 + -18x + 81

Reorder the terms:
-9 + 5x = 81 + -18x + x2

Solving
-9 + 5x = 81 + -18x + x2

Solving for variable 'x'.

Reorder the terms:
-9 + -81 + 5x + 18x + -1x2 = 81 + -18x + x2 + -81 + 18x + -1x2

Combine like terms: -9 + -81 = -90
-90 + 5x + 18x + -1x2 = 81 + -18x + x2 + -81 + 18x + -1x2

Combine like terms: 5x + 18x = 23x
-90 + 23x + -1x2 = 81 + -18x + x2 + -81 + 18x + -1x2

Reorder the terms:
-90 + 23x + -1x2 = 81 + -81 + -18x + 18x + x2 + -1x2

Combine like terms: 81 + -81 = 0
-90 + 23x + -1x2 = 0 + -18x + 18x + x2 + -1x2
-90 + 23x + -1x2 = -18x + 18x + x2 + -1x2

Combine like terms: -18x + 18x = 0
-90 + 23x + -1x2 = 0 + x2 + -1x2
-90 + 23x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-90 + 23x + -1x2 = 0

Factor a trinomial.
(-18 + x)(5 + -1x) = 0

Subproblem 1

Set the factor '(-18 + x)' equal to zero and attempt to solve: Simplifying -18 + x = 0 Solving -18 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + x = 0 + 18 Combine like terms: -18 + 18 = 0 0 + x = 0 + 18 x = 0 + 18 Combine like terms: 0 + 18 = 18 x = 18 Simplifying x = 18

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {18, 5}

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