4x^2-36x=-81

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Solution for 4x^2-36x=-81 equation:


Simplifying
4x2 + -36x = -81

Reorder the terms:
-36x + 4x2 = -81

Solving
-36x + 4x2 = -81

Solving for variable 'x'.

Reorder the terms:
81 + -36x + 4x2 = -81 + 81

Combine like terms: -81 + 81 = 0
81 + -36x + 4x2 = 0

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

Solution

x = {4.5, 4.5}

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