2x^2+31x=90

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Solution for 2x^2+31x=90 equation:


Simplifying
2x2 + 31x = 90

Reorder the terms:
31x + 2x2 = 90

Solving
31x + 2x2 = 90

Solving for variable 'x'.

Reorder the terms:
-90 + 31x + 2x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + 31x + 2x2 = 0

Factor a trinomial.
(-18 + -1x)(5 + -2x) = 0

Subproblem 1

Set the factor '(-18 + -1x)' equal to zero and attempt to solve: Simplifying -18 + -1x = 0 Solving -18 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -1x = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -1x = 0 + 18 -1x = 0 + 18 Combine like terms: 0 + 18 = 18 -1x = 18 Divide each side by '-1'. x = -18 Simplifying x = -18

Subproblem 2

Set the factor '(5 + -2x)' equal to zero and attempt to solve: Simplifying 5 + -2x = 0 Solving 5 + -2x = 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 + -2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 0 + -5 -2x = 0 + -5 Combine like terms: 0 + -5 = -5 -2x = -5 Divide each side by '-2'. x = 2.5 Simplifying x = 2.5

Solution

x = {-18, 2.5}

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