16x^2+72x=-81

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Solution for 16x^2+72x=-81 equation:


Simplifying
16x2 + 72x = -81

Reorder the terms:
72x + 16x2 = -81

Solving
72x + 16x2 = -81

Solving for variable 'x'.

Reorder the terms:
81 + 72x + 16x2 = -81 + 81

Combine like terms: -81 + 81 = 0
81 + 72x + 16x2 = 0

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

Subproblem 1

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

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 = {-2.25, -2.25}

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