0=2x^2-5x-18

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Solution for 0=2x^2-5x-18 equation:


Simplifying
0 = 2x2 + -5x + -18

Reorder the terms:
0 = -18 + -5x + 2x2

Solving
0 = -18 + -5x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 18 = 18
18 + 5x + -2x2 = -18 + -5x + 2x2 + 18 + 5x + -2x2

Reorder the terms:
18 + 5x + -2x2 = -18 + 18 + -5x + 5x + 2x2 + -2x2

Combine like terms: -18 + 18 = 0
18 + 5x + -2x2 = 0 + -5x + 5x + 2x2 + -2x2
18 + 5x + -2x2 = -5x + 5x + 2x2 + -2x2

Combine like terms: -5x + 5x = 0
18 + 5x + -2x2 = 0 + 2x2 + -2x2
18 + 5x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
18 + 5x + -2x2 = 0

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

Subproblem 1

Set the factor '(9 + -2x)' equal to zero and attempt to solve: Simplifying 9 + -2x = 0 Solving 9 + -2x = 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 + -2x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -2x = 0 + -9 -2x = 0 + -9 Combine like terms: 0 + -9 = -9 -2x = -9 Divide each side by '-2'. x = 4.5 Simplifying x = 4.5

Subproblem 2

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

Solution

x = {4.5, -2}

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