(11x-5)(7x+27)=180

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Solution for (11x-5)(7x+27)=180 equation:


Simplifying
(11x + -5)(7x + 27) = 180

Reorder the terms:
(-5 + 11x)(7x + 27) = 180

Reorder the terms:
(-5 + 11x)(27 + 7x) = 180

Multiply (-5 + 11x) * (27 + 7x)
(-5(27 + 7x) + 11x * (27 + 7x)) = 180
((27 * -5 + 7x * -5) + 11x * (27 + 7x)) = 180
((-135 + -35x) + 11x * (27 + 7x)) = 180
(-135 + -35x + (27 * 11x + 7x * 11x)) = 180
(-135 + -35x + (297x + 77x2)) = 180

Combine like terms: -35x + 297x = 262x
(-135 + 262x + 77x2) = 180

Solving
-135 + 262x + 77x2 = 180

Solving for variable 'x'.

Reorder the terms:
-135 + -180 + 262x + 77x2 = 180 + -180

Combine like terms: -135 + -180 = -315
-315 + 262x + 77x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-315 + 262x + 77x2 = 0

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

Divide each side by '77'.
-4.090909091 + 3.402597403x + x2 = 0

Move the constant term to the right:

Add '4.090909091' to each side of the equation.
-4.090909091 + 3.402597403x + 4.090909091 + x2 = 0 + 4.090909091

Reorder the terms:
-4.090909091 + 4.090909091 + 3.402597403x + x2 = 0 + 4.090909091

Combine like terms: -4.090909091 + 4.090909091 = 0.000000000
0.000000000 + 3.402597403x + x2 = 0 + 4.090909091
3.402597403x + x2 = 0 + 4.090909091

Combine like terms: 0 + 4.090909091 = 4.090909091
3.402597403x + x2 = 4.090909091

The x term is 3.402597403x.  Take half its coefficient (1.701298702).
Square it (2.894417273) and add it to both sides.

Add '2.894417273' to each side of the equation.
3.402597403x + 2.894417273 + x2 = 4.090909091 + 2.894417273

Reorder the terms:
2.894417273 + 3.402597403x + x2 = 4.090909091 + 2.894417273

Combine like terms: 4.090909091 + 2.894417273 = 6.985326364
2.894417273 + 3.402597403x + x2 = 6.985326364

Factor a perfect square on the left side:
(x + 1.701298702)(x + 1.701298702) = 6.985326364

Calculate the square root of the right side: 2.6429768

Break this problem into two subproblems by setting 
(x + 1.701298702) equal to 2.6429768 and -2.6429768.

Subproblem 1

x + 1.701298702 = 2.6429768 Simplifying x + 1.701298702 = 2.6429768 Reorder the terms: 1.701298702 + x = 2.6429768 Solving 1.701298702 + x = 2.6429768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.701298702' to each side of the equation. 1.701298702 + -1.701298702 + x = 2.6429768 + -1.701298702 Combine like terms: 1.701298702 + -1.701298702 = 0.000000000 0.000000000 + x = 2.6429768 + -1.701298702 x = 2.6429768 + -1.701298702 Combine like terms: 2.6429768 + -1.701298702 = 0.941678098 x = 0.941678098 Simplifying x = 0.941678098

Subproblem 2

x + 1.701298702 = -2.6429768 Simplifying x + 1.701298702 = -2.6429768 Reorder the terms: 1.701298702 + x = -2.6429768 Solving 1.701298702 + x = -2.6429768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.701298702' to each side of the equation. 1.701298702 + -1.701298702 + x = -2.6429768 + -1.701298702 Combine like terms: 1.701298702 + -1.701298702 = 0.000000000 0.000000000 + x = -2.6429768 + -1.701298702 x = -2.6429768 + -1.701298702 Combine like terms: -2.6429768 + -1.701298702 = -4.344275502 x = -4.344275502 Simplifying x = -4.344275502

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.941678098, -4.344275502}

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