(2x-1)(x+4)=18

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Solution for (2x-1)(x+4)=18 equation:


Simplifying
(2x + -1)(x + 4) = 18

Reorder the terms:
(-1 + 2x)(x + 4) = 18

Reorder the terms:
(-1 + 2x)(4 + x) = 18

Multiply (-1 + 2x) * (4 + x)
(-1(4 + x) + 2x * (4 + x)) = 18
((4 * -1 + x * -1) + 2x * (4 + x)) = 18
((-4 + -1x) + 2x * (4 + x)) = 18
(-4 + -1x + (4 * 2x + x * 2x)) = 18
(-4 + -1x + (8x + 2x2)) = 18

Combine like terms: -1x + 8x = 7x
(-4 + 7x + 2x2) = 18

Solving
-4 + 7x + 2x2 = 18

Solving for variable 'x'.

Reorder the terms:
-4 + -18 + 7x + 2x2 = 18 + -18

Combine like terms: -4 + -18 = -22
-22 + 7x + 2x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-22 + 7x + 2x2 = 0

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

Subproblem 1

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

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 = {-5.5, 2}

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