11x^2+11x-15=0

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Solution for 11x^2+11x-15=0 equation:


Simplifying
11x2 + 11x + -15 = 0

Reorder the terms:
-15 + 11x + 11x2 = 0

Solving
-15 + 11x + 11x2 = 0

Solving for variable 'x'.

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

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

Move the constant term to the right:

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

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

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

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

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 1.363636364 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1.363636364 + 0.25

Combine like terms: 1.363636364 + 0.25 = 1.613636364
1.25 + x2 = 1.613636364

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.613636364

Calculate the square root of the right side: 1.270289874

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.270289874 and -1.270289874.

Subproblem 1

x + 0.5 = 1.270289874 Simplifying x + 0.5 = 1.270289874 Reorder the terms: 0.5 + x = 1.270289874 Solving 0.5 + x = 1.270289874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.270289874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.270289874 + -0.5 x = 1.270289874 + -0.5 Combine like terms: 1.270289874 + -0.5 = 0.770289874 x = 0.770289874 Simplifying x = 0.770289874

Subproblem 2

x + 0.5 = -1.270289874 Simplifying x + 0.5 = -1.270289874 Reorder the terms: 0.5 + x = -1.270289874 Solving 0.5 + x = -1.270289874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.270289874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.270289874 + -0.5 x = -1.270289874 + -0.5 Combine like terms: -1.270289874 + -0.5 = -1.770289874 x = -1.770289874 Simplifying x = -1.770289874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.770289874, -1.770289874}

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