(8x-7)(4x-13)=180

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Solution for (8x-7)(4x-13)=180 equation:


Simplifying
(8x + -7)(4x + -13) = 180

Reorder the terms:
(-7 + 8x)(4x + -13) = 180

Reorder the terms:
(-7 + 8x)(-13 + 4x) = 180

Multiply (-7 + 8x) * (-13 + 4x)
(-7(-13 + 4x) + 8x * (-13 + 4x)) = 180
((-13 * -7 + 4x * -7) + 8x * (-13 + 4x)) = 180
((91 + -28x) + 8x * (-13 + 4x)) = 180
(91 + -28x + (-13 * 8x + 4x * 8x)) = 180
(91 + -28x + (-104x + 32x2)) = 180

Combine like terms: -28x + -104x = -132x
(91 + -132x + 32x2) = 180

Solving
91 + -132x + 32x2 = 180

Solving for variable 'x'.

Reorder the terms:
91 + -180 + -132x + 32x2 = 180 + -180

Combine like terms: 91 + -180 = -89
-89 + -132x + 32x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-89 + -132x + 32x2 = 0

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

Divide each side by '32'.
-2.78125 + -4.125x + x2 = 0

Move the constant term to the right:

Add '2.78125' to each side of the equation.
-2.78125 + -4.125x + 2.78125 + x2 = 0 + 2.78125

Reorder the terms:
-2.78125 + 2.78125 + -4.125x + x2 = 0 + 2.78125

Combine like terms: -2.78125 + 2.78125 = 0.00000
0.00000 + -4.125x + x2 = 0 + 2.78125
-4.125x + x2 = 0 + 2.78125

Combine like terms: 0 + 2.78125 = 2.78125
-4.125x + x2 = 2.78125

The x term is -4.125x.  Take half its coefficient (-2.0625).
Square it (4.25390625) and add it to both sides.

Add '4.25390625' to each side of the equation.
-4.125x + 4.25390625 + x2 = 2.78125 + 4.25390625

Reorder the terms:
4.25390625 + -4.125x + x2 = 2.78125 + 4.25390625

Combine like terms: 2.78125 + 4.25390625 = 7.03515625
4.25390625 + -4.125x + x2 = 7.03515625

Factor a perfect square on the left side:
(x + -2.0625)(x + -2.0625) = 7.03515625

Calculate the square root of the right side: 2.652386897

Break this problem into two subproblems by setting 
(x + -2.0625) equal to 2.652386897 and -2.652386897.

Subproblem 1

x + -2.0625 = 2.652386897 Simplifying x + -2.0625 = 2.652386897 Reorder the terms: -2.0625 + x = 2.652386897 Solving -2.0625 + x = 2.652386897 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.0625' to each side of the equation. -2.0625 + 2.0625 + x = 2.652386897 + 2.0625 Combine like terms: -2.0625 + 2.0625 = 0.0000 0.0000 + x = 2.652386897 + 2.0625 x = 2.652386897 + 2.0625 Combine like terms: 2.652386897 + 2.0625 = 4.714886897 x = 4.714886897 Simplifying x = 4.714886897

Subproblem 2

x + -2.0625 = -2.652386897 Simplifying x + -2.0625 = -2.652386897 Reorder the terms: -2.0625 + x = -2.652386897 Solving -2.0625 + x = -2.652386897 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.0625' to each side of the equation. -2.0625 + 2.0625 + x = -2.652386897 + 2.0625 Combine like terms: -2.0625 + 2.0625 = 0.0000 0.0000 + x = -2.652386897 + 2.0625 x = -2.652386897 + 2.0625 Combine like terms: -2.652386897 + 2.0625 = -0.589886897 x = -0.589886897 Simplifying x = -0.589886897

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.714886897, -0.589886897}

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