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

Solution for (2x+3)(x-1)=18 equation:

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

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

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

Multiply (3 + 2x) * (-1 + x)
(3(-1 + x) + 2x * (-1 + x)) = 18
((-1 * 3 + x * 3) + 2x * (-1 + x)) = 18
((-3 + 3x) + 2x * (-1 + x)) = 18
(-3 + 3x + (-1 * 2x + x * 2x)) = 18
(-3 + 3x + (-2x + 2x2)) = 18

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

Solving
-3 + 1x + 2x2 = 18

Solving for variable 'x'.

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

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

Combine like terms: 18 + -18 = 0
-21 + 1x + 2x2 = 0

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

Subproblem 1
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
Subproblem 2
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
Solution
x = {-3.5, 3}