8x^2+18x=81

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Solution for 8x^2+18x=81 equation:


Simplifying
8x2 + 18x = 81

Reorder the terms:
18x + 8x2 = 81

Solving
18x + 8x2 = 81

Solving for variable 'x'.

Reorder the terms:
-81 + 18x + 8x2 = 81 + -81

Combine like terms: 81 + -81 = 0
-81 + 18x + 8x2 = 0

Factor a trinomial.
(-9 + -2x)(9 + -4x) = 0

Subproblem 1

Set the factor '(-9 + -2x)' equal to zero and attempt to solve: Simplifying -9 + -2x = 0 Solving -9 + -2x = 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 + -2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -2x = 0 + 9 -2x = 0 + 9 Combine like terms: 0 + 9 = 9 -2x = 9 Divide each side by '-2'. x = -4.5 Simplifying x = -4.5

Subproblem 2

Set the factor '(9 + -4x)' equal to zero and attempt to solve: Simplifying 9 + -4x = 0 Solving 9 + -4x = 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 + -4x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -4x = 0 + -9 -4x = 0 + -9 Combine like terms: 0 + -9 = -9 -4x = -9 Divide each side by '-4'. x = 2.25 Simplifying x = 2.25

Solution

x = {-4.5, 2.25}

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