(2x+3)(x)=360

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Solution for (2x+3)(x)=360 equation:


Simplifying
(2x + 3)(x) = 360

Reorder the terms:
(3 + 2x)(x) = 360

Reorder the terms for easier multiplication:
x(3 + 2x) = 360
(3 * x + 2x * x) = 360
(3x + 2x2) = 360

Solving
3x + 2x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 3x + 2x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 3x + 2x2 = 0

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

Divide each side by '2'.
-180 + 1.5x + x2 = 0

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + 1.5x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + 1.5x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 1.5x + x2 = 0 + 180
1.5x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
1.5x + x2 = 180

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 = 180 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 180 + 0.5625

Combine like terms: 180 + 0.5625 = 180.5625
0.5625 + 1.5x + x2 = 180.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 180.5625

Calculate the square root of the right side: 13.43735465

Break this problem into two subproblems by setting 
(x + 0.75) equal to 13.43735465 and -13.43735465.

Subproblem 1

x + 0.75 = 13.43735465 Simplifying x + 0.75 = 13.43735465 Reorder the terms: 0.75 + x = 13.43735465 Solving 0.75 + x = 13.43735465 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 = 13.43735465 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 13.43735465 + -0.75 x = 13.43735465 + -0.75 Combine like terms: 13.43735465 + -0.75 = 12.68735465 x = 12.68735465 Simplifying x = 12.68735465

Subproblem 2

x + 0.75 = -13.43735465 Simplifying x + 0.75 = -13.43735465 Reorder the terms: 0.75 + x = -13.43735465 Solving 0.75 + x = -13.43735465 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 = -13.43735465 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -13.43735465 + -0.75 x = -13.43735465 + -0.75 Combine like terms: -13.43735465 + -0.75 = -14.18735465 x = -14.18735465 Simplifying x = -14.18735465

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.68735465, -14.18735465}

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