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

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


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

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

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

Multiply (1 + 2x) * (3 + x)
(1(3 + x) + 2x * (3 + x)) = 18
((3 * 1 + x * 1) + 2x * (3 + x)) = 18
((3 + 1x) + 2x * (3 + x)) = 18
(3 + 1x + (3 * 2x + x * 2x)) = 18
(3 + 1x + (6x + 2x2)) = 18

Combine like terms: 1x + 6x = 7x
(3 + 7x + 2x2) = 18

Solving
3 + 7x + 2x2 = 18

Solving for variable 'x'.

Reorder the terms:
3 + -18 + 7x + 2x2 = 18 + -18

Combine like terms: 3 + -18 = -15
-15 + 7x + 2x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-15 + 7x + 2x2 = 0

Factor a trinomial.
(-5 + -1x)(3 + -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 '(3 + -2x)' equal to zero and attempt to solve: Simplifying 3 + -2x = 0 Solving 3 + -2x = 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 + -2x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = 0 + -3 -2x = 0 + -3 Combine like terms: 0 + -3 = -3 -2x = -3 Divide each side by '-2'. x = 1.5 Simplifying x = 1.5

Solution

x = {-5, 1.5}

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