56x^2-56x-15=0

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Solution for 56x^2-56x-15=0 equation:


Simplifying
56x2 + -56x + -15 = 0

Reorder the terms:
-15 + -56x + 56x2 = 0

Solving
-15 + -56x + 56x2 = 0

Solving for variable 'x'.

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

Divide each side by '56'.
-0.2678571429 + -1x + x2 = 0

Move the constant term to the right:

Add '0.2678571429' to each side of the equation.
-0.2678571429 + -1x + 0.2678571429 + x2 = 0 + 0.2678571429

Reorder the terms:
-0.2678571429 + 0.2678571429 + -1x + x2 = 0 + 0.2678571429

Combine like terms: -0.2678571429 + 0.2678571429 = 0.0000000000
0.0000000000 + -1x + x2 = 0 + 0.2678571429
-1x + x2 = 0 + 0.2678571429

Combine like terms: 0 + 0.2678571429 = 0.2678571429
-1x + x2 = 0.2678571429

The x term is -1x.  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.
-1x + 0.25 + x2 = 0.2678571429 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 0.2678571429 + 0.25

Combine like terms: 0.2678571429 + 0.25 = 0.5178571429
0.25 + -1x + x2 = 0.5178571429

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 0.5178571429

Calculate the square root of the right side: 0.719622917

Break this problem into two subproblems by setting 
(x + -0.5) equal to 0.719622917 and -0.719622917.

Subproblem 1

x + -0.5 = 0.719622917 Simplifying x + -0.5 = 0.719622917 Reorder the terms: -0.5 + x = 0.719622917 Solving -0.5 + x = 0.719622917 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 = 0.719622917 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 0.719622917 + 0.5 x = 0.719622917 + 0.5 Combine like terms: 0.719622917 + 0.5 = 1.219622917 x = 1.219622917 Simplifying x = 1.219622917

Subproblem 2

x + -0.5 = -0.719622917 Simplifying x + -0.5 = -0.719622917 Reorder the terms: -0.5 + x = -0.719622917 Solving -0.5 + x = -0.719622917 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 = -0.719622917 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -0.719622917 + 0.5 x = -0.719622917 + 0.5 Combine like terms: -0.719622917 + 0.5 = -0.219622917 x = -0.219622917 Simplifying x = -0.219622917

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.219622917, -0.219622917}

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