(2x^2-x-18)=3

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Solution for (2x^2-x-18)=3 equation:


Simplifying
(2x2 + -1x + -18) = 3

Reorder the terms:
(-18 + -1x + 2x2) = 3

Remove parenthesis around (-18 + -1x + 2x2)
-18 + -1x + 2x2 = 3

Solving
-18 + -1x + 2x2 = 3

Solving for variable 'x'.

Reorder the terms:
-18 + -3 + -1x + 2x2 = 3 + -3

Combine like terms: -18 + -3 = -21
-21 + -1x + 2x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-21 + -1x + 2x2 = 0

Factor a trinomial.
(-3 + -1x)(7 + -2x) = 0

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(7 + -2x)' equal to zero and attempt to solve: Simplifying 7 + -2x = 0 Solving 7 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 0 + -7 -2x = 0 + -7 Combine like terms: 0 + -7 = -7 -2x = -7 Divide each side by '-2'. x = 3.5 Simplifying x = 3.5

Solution

x = {-3, 3.5}

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