8x^2-10x-11=0

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Solution for 8x^2-10x-11=0 equation:


Simplifying
8x2 + -10x + -11 = 0

Reorder the terms:
-11 + -10x + 8x2 = 0

Solving
-11 + -10x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-1.375 + -1.25x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + -1.25x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + -1.25x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + -1.25x + x2 = 0 + 1.375
-1.25x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
-1.25x + x2 = 1.375

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 1.375 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 1.375 + 0.390625

Combine like terms: 1.375 + 0.390625 = 1.765625
0.390625 + -1.25x + x2 = 1.765625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 1.765625

Calculate the square root of the right side: 1.328768227

Break this problem into two subproblems by setting 
(x + -0.625) equal to 1.328768227 and -1.328768227.

Subproblem 1

x + -0.625 = 1.328768227 Simplifying x + -0.625 = 1.328768227 Reorder the terms: -0.625 + x = 1.328768227 Solving -0.625 + x = 1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 1.328768227 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 1.328768227 + 0.625 x = 1.328768227 + 0.625 Combine like terms: 1.328768227 + 0.625 = 1.953768227 x = 1.953768227 Simplifying x = 1.953768227

Subproblem 2

x + -0.625 = -1.328768227 Simplifying x + -0.625 = -1.328768227 Reorder the terms: -0.625 + x = -1.328768227 Solving -0.625 + x = -1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -1.328768227 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -1.328768227 + 0.625 x = -1.328768227 + 0.625 Combine like terms: -1.328768227 + 0.625 = -0.703768227 x = -0.703768227 Simplifying x = -0.703768227

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.953768227, -0.703768227}

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