11x(6x-5)=40

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Solution for 11x(6x-5)=40 equation:


Simplifying
11x(6x + -5) = 40

Reorder the terms:
11x(-5 + 6x) = 40
(-5 * 11x + 6x * 11x) = 40
(-55x + 66x2) = 40

Solving
-55x + 66x2 = 40

Solving for variable 'x'.

Reorder the terms:
-40 + -55x + 66x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + -55x + 66x2 = 0

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

Divide each side by '66'.
-0.6060606061 + -0.8333333333x + x2 = 0

Move the constant term to the right:

Add '0.6060606061' to each side of the equation.
-0.6060606061 + -0.8333333333x + 0.6060606061 + x2 = 0 + 0.6060606061

Reorder the terms:
-0.6060606061 + 0.6060606061 + -0.8333333333x + x2 = 0 + 0.6060606061

Combine like terms: -0.6060606061 + 0.6060606061 = 0.0000000000
0.0000000000 + -0.8333333333x + x2 = 0 + 0.6060606061
-0.8333333333x + x2 = 0 + 0.6060606061

Combine like terms: 0 + 0.6060606061 = 0.6060606061
-0.8333333333x + x2 = 0.6060606061

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 = 0.6060606061 + 0.1736111111

Reorder the terms:
0.1736111111 + -0.8333333333x + x2 = 0.6060606061 + 0.1736111111

Combine like terms: 0.6060606061 + 0.1736111111 = 0.7796717172
0.1736111111 + -0.8333333333x + x2 = 0.7796717172

Factor a perfect square on the left side:
(x + -0.4166666667)(x + -0.4166666667) = 0.7796717172

Calculate the square root of the right side: 0.882990214

Break this problem into two subproblems by setting 
(x + -0.4166666667) equal to 0.882990214 and -0.882990214.

Subproblem 1

x + -0.4166666667 = 0.882990214 Simplifying x + -0.4166666667 = 0.882990214 Reorder the terms: -0.4166666667 + x = 0.882990214 Solving -0.4166666667 + x = 0.882990214 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 = 0.882990214 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = 0.882990214 + 0.4166666667 x = 0.882990214 + 0.4166666667 Combine like terms: 0.882990214 + 0.4166666667 = 1.2996568807 x = 1.2996568807 Simplifying x = 1.2996568807

Subproblem 2

x + -0.4166666667 = -0.882990214 Simplifying x + -0.4166666667 = -0.882990214 Reorder the terms: -0.4166666667 + x = -0.882990214 Solving -0.4166666667 + x = -0.882990214 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 = -0.882990214 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = -0.882990214 + 0.4166666667 x = -0.882990214 + 0.4166666667 Combine like terms: -0.882990214 + 0.4166666667 = -0.4663235473 x = -0.4663235473 Simplifying x = -0.4663235473

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2996568807, -0.4663235473}

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