11x^2=15x+5

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Solution for 11x^2=15x+5 equation:


Simplifying
11x2 = 15x + 5

Reorder the terms:
11x2 = 5 + 15x

Solving
11x2 = 5 + 15x

Solving for variable 'x'.

Reorder the terms:
-5 + -15x + 11x2 = 5 + 15x + -5 + -15x

Reorder the terms:
-5 + -15x + 11x2 = 5 + -5 + 15x + -15x

Combine like terms: 5 + -5 = 0
-5 + -15x + 11x2 = 0 + 15x + -15x
-5 + -15x + 11x2 = 15x + -15x

Combine like terms: 15x + -15x = 0
-5 + -15x + 11x2 = 0

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

Divide each side by '11'.
-0.4545454545 + -1.363636364x + x2 = 0

Move the constant term to the right:

Add '0.4545454545' to each side of the equation.
-0.4545454545 + -1.363636364x + 0.4545454545 + x2 = 0 + 0.4545454545

Reorder the terms:
-0.4545454545 + 0.4545454545 + -1.363636364x + x2 = 0 + 0.4545454545

Combine like terms: -0.4545454545 + 0.4545454545 = 0.0000000000
0.0000000000 + -1.363636364x + x2 = 0 + 0.4545454545
-1.363636364x + x2 = 0 + 0.4545454545

Combine like terms: 0 + 0.4545454545 = 0.4545454545
-1.363636364x + x2 = 0.4545454545

The x term is -1.363636364x.  Take half its coefficient (-0.681818182).
Square it (0.4648760333) and add it to both sides.

Add '0.4648760333' to each side of the equation.
-1.363636364x + 0.4648760333 + x2 = 0.4545454545 + 0.4648760333

Reorder the terms:
0.4648760333 + -1.363636364x + x2 = 0.4545454545 + 0.4648760333

Combine like terms: 0.4545454545 + 0.4648760333 = 0.9194214878
0.4648760333 + -1.363636364x + x2 = 0.9194214878

Factor a perfect square on the left side:
(x + -0.681818182)(x + -0.681818182) = 0.9194214878

Calculate the square root of the right side: 0.958864687

Break this problem into two subproblems by setting 
(x + -0.681818182) equal to 0.958864687 and -0.958864687.

Subproblem 1

x + -0.681818182 = 0.958864687 Simplifying x + -0.681818182 = 0.958864687 Reorder the terms: -0.681818182 + x = 0.958864687 Solving -0.681818182 + x = 0.958864687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.681818182' to each side of the equation. -0.681818182 + 0.681818182 + x = 0.958864687 + 0.681818182 Combine like terms: -0.681818182 + 0.681818182 = 0.000000000 0.000000000 + x = 0.958864687 + 0.681818182 x = 0.958864687 + 0.681818182 Combine like terms: 0.958864687 + 0.681818182 = 1.640682869 x = 1.640682869 Simplifying x = 1.640682869

Subproblem 2

x + -0.681818182 = -0.958864687 Simplifying x + -0.681818182 = -0.958864687 Reorder the terms: -0.681818182 + x = -0.958864687 Solving -0.681818182 + x = -0.958864687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.681818182' to each side of the equation. -0.681818182 + 0.681818182 + x = -0.958864687 + 0.681818182 Combine like terms: -0.681818182 + 0.681818182 = 0.000000000 0.000000000 + x = -0.958864687 + 0.681818182 x = -0.958864687 + 0.681818182 Combine like terms: -0.958864687 + 0.681818182 = -0.277046505 x = -0.277046505 Simplifying x = -0.277046505

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.640682869, -0.277046505}

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