5x^2-x=18

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Solution for 5x^2-x=18 equation:


Simplifying
5x2 + -1x = 18

Reorder the terms:
-1x + 5x2 = 18

Solving
-1x + 5x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + -1x + 5x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -1x + 5x2 = 0

Factor a trinomial.
(-9 + -5x)(2 + -1x) = 0

Subproblem 1

Set the factor '(-9 + -5x)' equal to zero and attempt to solve: Simplifying -9 + -5x = 0 Solving -9 + -5x = 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 + -5x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -5x = 0 + 9 -5x = 0 + 9 Combine like terms: 0 + 9 = 9 -5x = 9 Divide each side by '-5'. x = -1.8 Simplifying x = -1.8

Subproblem 2

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 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 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Solution

x = {-1.8, 2}

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