2x^2=9x+81

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Solution for 2x^2=9x+81 equation:


Simplifying
2x2 = 9x + 81

Reorder the terms:
2x2 = 81 + 9x

Solving
2x2 = 81 + 9x

Solving for variable 'x'.

Reorder the terms:
-81 + -9x + 2x2 = 81 + 9x + -81 + -9x

Reorder the terms:
-81 + -9x + 2x2 = 81 + -81 + 9x + -9x

Combine like terms: 81 + -81 = 0
-81 + -9x + 2x2 = 0 + 9x + -9x
-81 + -9x + 2x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-81 + -9x + 2x2 = 0

Factor a trinomial.
(-9 + -2x)(9 + -1x) = 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 + -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 = {-4.5, 9}

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