(11x)(6x+5)=90

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Solution for (11x)(6x+5)=90 equation:


Simplifying
(11x)(6x + 5) = 90

Remove parenthesis around (11x)
11x(6x + 5) = 90

Reorder the terms:
11x(5 + 6x) = 90
(5 * 11x + 6x * 11x) = 90
(55x + 66x2) = 90

Solving
55x + 66x2 = 90

Solving for variable 'x'.

Reorder the terms:
-90 + 55x + 66x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + 55x + 66x2 = 0

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

Divide each side by '66'.
-1.363636364 + 0.8333333333x + x2 = 0

Move the constant term to the right:

Add '1.363636364' to each side of the equation.
-1.363636364 + 0.8333333333x + 1.363636364 + x2 = 0 + 1.363636364

Reorder the terms:
-1.363636364 + 1.363636364 + 0.8333333333x + x2 = 0 + 1.363636364

Combine like terms: -1.363636364 + 1.363636364 = 0.000000000
0.000000000 + 0.8333333333x + x2 = 0 + 1.363636364
0.8333333333x + x2 = 0 + 1.363636364

Combine like terms: 0 + 1.363636364 = 1.363636364
0.8333333333x + x2 = 1.363636364

The x term is 0.8333333333x.  Take half its coefficient (0.4166666667).
Square it (0.1736111111) and add it to both sides.

Add '0.1736111111' to each side of the equation.
0.8333333333x + 0.1736111111 + x2 = 1.363636364 + 0.1736111111

Reorder the terms:
0.1736111111 + 0.8333333333x + x2 = 1.363636364 + 0.1736111111

Combine like terms: 1.363636364 + 0.1736111111 = 1.5372474751
0.1736111111 + 0.8333333333x + x2 = 1.5372474751

Factor a perfect square on the left side:
(x + 0.4166666667)(x + 0.4166666667) = 1.5372474751

Calculate the square root of the right side: 1.239857845

Break this problem into two subproblems by setting 
(x + 0.4166666667) equal to 1.239857845 and -1.239857845.

Subproblem 1

x + 0.4166666667 = 1.239857845 Simplifying x + 0.4166666667 = 1.239857845 Reorder the terms: 0.4166666667 + x = 1.239857845 Solving 0.4166666667 + x = 1.239857845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4166666667' to each side of the equation. 0.4166666667 + -0.4166666667 + x = 1.239857845 + -0.4166666667 Combine like terms: 0.4166666667 + -0.4166666667 = 0.0000000000 0.0000000000 + x = 1.239857845 + -0.4166666667 x = 1.239857845 + -0.4166666667 Combine like terms: 1.239857845 + -0.4166666667 = 0.8231911783 x = 0.8231911783 Simplifying x = 0.8231911783

Subproblem 2

x + 0.4166666667 = -1.239857845 Simplifying x + 0.4166666667 = -1.239857845 Reorder the terms: 0.4166666667 + x = -1.239857845 Solving 0.4166666667 + x = -1.239857845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4166666667' to each side of the equation. 0.4166666667 + -0.4166666667 + x = -1.239857845 + -0.4166666667 Combine like terms: 0.4166666667 + -0.4166666667 = 0.0000000000 0.0000000000 + x = -1.239857845 + -0.4166666667 x = -1.239857845 + -0.4166666667 Combine like terms: -1.239857845 + -0.4166666667 = -1.6565245117 x = -1.6565245117 Simplifying x = -1.6565245117

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8231911783, -1.6565245117}

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