(8x+13)(12x-7)=180

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Solution for (8x+13)(12x-7)=180 equation:


Simplifying
(8x + 13)(12x + -7) = 180

Reorder the terms:
(13 + 8x)(12x + -7) = 180

Reorder the terms:
(13 + 8x)(-7 + 12x) = 180

Multiply (13 + 8x) * (-7 + 12x)
(13(-7 + 12x) + 8x * (-7 + 12x)) = 180
((-7 * 13 + 12x * 13) + 8x * (-7 + 12x)) = 180
((-91 + 156x) + 8x * (-7 + 12x)) = 180
(-91 + 156x + (-7 * 8x + 12x * 8x)) = 180
(-91 + 156x + (-56x + 96x2)) = 180

Combine like terms: 156x + -56x = 100x
(-91 + 100x + 96x2) = 180

Solving
-91 + 100x + 96x2 = 180

Solving for variable 'x'.

Reorder the terms:
-91 + -180 + 100x + 96x2 = 180 + -180

Combine like terms: -91 + -180 = -271
-271 + 100x + 96x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-271 + 100x + 96x2 = 0

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

Divide each side by '96'.
-2.822916667 + 1.041666667x + x2 = 0

Move the constant term to the right:

Add '2.822916667' to each side of the equation.
-2.822916667 + 1.041666667x + 2.822916667 + x2 = 0 + 2.822916667

Reorder the terms:
-2.822916667 + 2.822916667 + 1.041666667x + x2 = 0 + 2.822916667

Combine like terms: -2.822916667 + 2.822916667 = 0.000000000
0.000000000 + 1.041666667x + x2 = 0 + 2.822916667
1.041666667x + x2 = 0 + 2.822916667

Combine like terms: 0 + 2.822916667 = 2.822916667
1.041666667x + x2 = 2.822916667

The x term is 1.041666667x.  Take half its coefficient (0.5208333335).
Square it (0.2712673613) and add it to both sides.

Add '0.2712673613' to each side of the equation.
1.041666667x + 0.2712673613 + x2 = 2.822916667 + 0.2712673613

Reorder the terms:
0.2712673613 + 1.041666667x + x2 = 2.822916667 + 0.2712673613

Combine like terms: 2.822916667 + 0.2712673613 = 3.0941840283
0.2712673613 + 1.041666667x + x2 = 3.0941840283

Factor a perfect square on the left side:
(x + 0.5208333335)(x + 0.5208333335) = 3.0941840283

Calculate the square root of the right side: 1.759029286

Break this problem into two subproblems by setting 
(x + 0.5208333335) equal to 1.759029286 and -1.759029286.

Subproblem 1

x + 0.5208333335 = 1.759029286 Simplifying x + 0.5208333335 = 1.759029286 Reorder the terms: 0.5208333335 + x = 1.759029286 Solving 0.5208333335 + x = 1.759029286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5208333335' to each side of the equation. 0.5208333335 + -0.5208333335 + x = 1.759029286 + -0.5208333335 Combine like terms: 0.5208333335 + -0.5208333335 = 0.0000000000 0.0000000000 + x = 1.759029286 + -0.5208333335 x = 1.759029286 + -0.5208333335 Combine like terms: 1.759029286 + -0.5208333335 = 1.2381959525 x = 1.2381959525 Simplifying x = 1.2381959525

Subproblem 2

x + 0.5208333335 = -1.759029286 Simplifying x + 0.5208333335 = -1.759029286 Reorder the terms: 0.5208333335 + x = -1.759029286 Solving 0.5208333335 + x = -1.759029286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5208333335' to each side of the equation. 0.5208333335 + -0.5208333335 + x = -1.759029286 + -0.5208333335 Combine like terms: 0.5208333335 + -0.5208333335 = 0.0000000000 0.0000000000 + x = -1.759029286 + -0.5208333335 x = -1.759029286 + -0.5208333335 Combine like terms: -1.759029286 + -0.5208333335 = -2.2798626195 x = -2.2798626195 Simplifying x = -2.2798626195

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2381959525, -2.2798626195}

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