5x(2x+3)=18

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Solution for 5x(2x+3)=18 equation:


Simplifying
5x(2x + 3) = 18

Reorder the terms:
5x(3 + 2x) = 18
(3 * 5x + 2x * 5x) = 18
(15x + 10x2) = 18

Solving
15x + 10x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 15x + 10x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 15x + 10x2 = 0

Begin completing the square.  Divide all terms by
10 the coefficient of the squared term: 

Divide each side by '10'.
-1.8 + 1.5x + x2 = 0.0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + 1.5x + 1.8 + x2 = 0.0 + 1.8

Reorder the terms:
-1.8 + 1.8 + 1.5x + x2 = 0.0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + 1.5x + x2 = 0.0 + 1.8
1.5x + x2 = 0.0 + 1.8

Combine like terms: 0.0 + 1.8 = 1.8
1.5x + x2 = 1.8

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 1.8 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 1.8 + 0.5625

Combine like terms: 1.8 + 0.5625 = 2.3625
0.5625 + 1.5x + x2 = 2.3625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 2.3625

Calculate the square root of the right side: 1.537042615

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.537042615 and -1.537042615.

Subproblem 1

x + 0.75 = 1.537042615 Simplifying x + 0.75 = 1.537042615 Reorder the terms: 0.75 + x = 1.537042615 Solving 0.75 + x = 1.537042615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.537042615 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.537042615 + -0.75 x = 1.537042615 + -0.75 Combine like terms: 1.537042615 + -0.75 = 0.787042615 x = 0.787042615 Simplifying x = 0.787042615

Subproblem 2

x + 0.75 = -1.537042615 Simplifying x + 0.75 = -1.537042615 Reorder the terms: 0.75 + x = -1.537042615 Solving 0.75 + x = -1.537042615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.537042615 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.537042615 + -0.75 x = -1.537042615 + -0.75 Combine like terms: -1.537042615 + -0.75 = -2.287042615 x = -2.287042615 Simplifying x = -2.287042615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.787042615, -2.287042615}

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