2x^2-x=55

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Solution for 2x^2-x=55 equation:


Simplifying
2x2 + -1x = 55

Reorder the terms:
-1x + 2x2 = 55

Solving
-1x + 2x2 = 55

Solving for variable 'x'.

Reorder the terms:
-55 + -1x + 2x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + -1x + 2x2 = 0

Factor a trinomial.
(-5 + -1x)(11 + -2x) = 0

Subproblem 1

Set the factor '(-5 + -1x)' equal to zero and attempt to solve: Simplifying -5 + -1x = 0 Solving -5 + -1x = 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 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5

Subproblem 2

Set the factor '(11 + -2x)' equal to zero and attempt to solve: Simplifying 11 + -2x = 0 Solving 11 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -2x = 0 + -11 Combine like terms: 11 + -11 = 0 0 + -2x = 0 + -11 -2x = 0 + -11 Combine like terms: 0 + -11 = -11 -2x = -11 Divide each side by '-2'. x = 5.5 Simplifying x = 5.5

Solution

x = {-5, 5.5}

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