-9x^2+31x=-20

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Solution for -9x^2+31x=-20 equation:


Simplifying
-9x2 + 31x = -20

Reorder the terms:
31x + -9x2 = -20

Solving
31x + -9x2 = -20

Solving for variable 'x'.

Reorder the terms:
20 + 31x + -9x2 = -20 + 20

Combine like terms: -20 + 20 = 0
20 + 31x + -9x2 = 0

Factor a trinomial.
(4 + -1x)(5 + 9x) = 0

Subproblem 1

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Subproblem 2

Set the factor '(5 + 9x)' equal to zero and attempt to solve: Simplifying 5 + 9x = 0 Solving 5 + 9x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 9x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 9x = 0 + -5 9x = 0 + -5 Combine like terms: 0 + -5 = -5 9x = -5 Divide each side by '9'. x = -0.5555555556 Simplifying x = -0.5555555556

Solution

x = {4, -0.5555555556}

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