(7x-12)(5x+18)=180

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Solution for (7x-12)(5x+18)=180 equation:


Simplifying
(7x + -12)(5x + 18) = 180

Reorder the terms:
(-12 + 7x)(5x + 18) = 180

Reorder the terms:
(-12 + 7x)(18 + 5x) = 180

Multiply (-12 + 7x) * (18 + 5x)
(-12(18 + 5x) + 7x * (18 + 5x)) = 180
((18 * -12 + 5x * -12) + 7x * (18 + 5x)) = 180
((-216 + -60x) + 7x * (18 + 5x)) = 180
(-216 + -60x + (18 * 7x + 5x * 7x)) = 180
(-216 + -60x + (126x + 35x2)) = 180

Combine like terms: -60x + 126x = 66x
(-216 + 66x + 35x2) = 180

Solving
-216 + 66x + 35x2 = 180

Solving for variable 'x'.

Reorder the terms:
-216 + -180 + 66x + 35x2 = 180 + -180

Combine like terms: -216 + -180 = -396
-396 + 66x + 35x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-396 + 66x + 35x2 = 0

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

Divide each side by '35'.
-11.31428571 + 1.885714286x + x2 = 0

Move the constant term to the right:

Add '11.31428571' to each side of the equation.
-11.31428571 + 1.885714286x + 11.31428571 + x2 = 0 + 11.31428571

Reorder the terms:
-11.31428571 + 11.31428571 + 1.885714286x + x2 = 0 + 11.31428571

Combine like terms: -11.31428571 + 11.31428571 = 0.00000000
0.00000000 + 1.885714286x + x2 = 0 + 11.31428571
1.885714286x + x2 = 0 + 11.31428571

Combine like terms: 0 + 11.31428571 = 11.31428571
1.885714286x + x2 = 11.31428571

The x term is 1.885714286x.  Take half its coefficient (0.942857143).
Square it (0.8889795921) and add it to both sides.

Add '0.8889795921' to each side of the equation.
1.885714286x + 0.8889795921 + x2 = 11.31428571 + 0.8889795921

Reorder the terms:
0.8889795921 + 1.885714286x + x2 = 11.31428571 + 0.8889795921

Combine like terms: 11.31428571 + 0.8889795921 = 12.2032653021
0.8889795921 + 1.885714286x + x2 = 12.2032653021

Factor a perfect square on the left side:
(x + 0.942857143)(x + 0.942857143) = 12.2032653021

Calculate the square root of the right side: 3.493317235

Break this problem into two subproblems by setting 
(x + 0.942857143) equal to 3.493317235 and -3.493317235.

Subproblem 1

x + 0.942857143 = 3.493317235 Simplifying x + 0.942857143 = 3.493317235 Reorder the terms: 0.942857143 + x = 3.493317235 Solving 0.942857143 + x = 3.493317235 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.942857143' to each side of the equation. 0.942857143 + -0.942857143 + x = 3.493317235 + -0.942857143 Combine like terms: 0.942857143 + -0.942857143 = 0.000000000 0.000000000 + x = 3.493317235 + -0.942857143 x = 3.493317235 + -0.942857143 Combine like terms: 3.493317235 + -0.942857143 = 2.550460092 x = 2.550460092 Simplifying x = 2.550460092

Subproblem 2

x + 0.942857143 = -3.493317235 Simplifying x + 0.942857143 = -3.493317235 Reorder the terms: 0.942857143 + x = -3.493317235 Solving 0.942857143 + x = -3.493317235 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.942857143' to each side of the equation. 0.942857143 + -0.942857143 + x = -3.493317235 + -0.942857143 Combine like terms: 0.942857143 + -0.942857143 = 0.000000000 0.000000000 + x = -3.493317235 + -0.942857143 x = -3.493317235 + -0.942857143 Combine like terms: -3.493317235 + -0.942857143 = -4.436174378 x = -4.436174378 Simplifying x = -4.436174378

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.550460092, -4.436174378}

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