81x^2+72x-20=0

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Solution for 81x^2+72x-20=0 equation:


Simplifying
81x2 + 72x + -20 = 0

Reorder the terms:
-20 + 72x + 81x2 = 0

Solving
-20 + 72x + 81x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-10 + -9x)(2 + -9x) = 0

Subproblem 1

Set the factor '(-10 + -9x)' equal to zero and attempt to solve: Simplifying -10 + -9x = 0 Solving -10 + -9x = 0 Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -9x = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -9x = 0 + 10 -9x = 0 + 10 Combine like terms: 0 + 10 = 10 -9x = 10 Divide each side by '-9'. x = -1.111111111 Simplifying x = -1.111111111

Subproblem 2

Set the factor '(2 + -9x)' equal to zero and attempt to solve: Simplifying 2 + -9x = 0 Solving 2 + -9x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -9x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -9x = 0 + -2 -9x = 0 + -2 Combine like terms: 0 + -2 = -2 -9x = -2 Divide each side by '-9'. x = 0.2222222222 Simplifying x = 0.2222222222

Solution

x = {-1.111111111, 0.2222222222}

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