81=-36x-4x^2

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


Simplifying
81 = -36x + -4x2

Solving
81 = -36x + -4x2

Solving for variable 'x'.

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

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

Combine like terms: -4x2 + 4x2 = 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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