8x^2-14x-11=0

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Solution for 8x^2-14x-11=0 equation:


Simplifying
8x2 + -14x + -11 = 0

Reorder the terms:
-11 + -14x + 8x2 = 0

Solving
-11 + -14x + 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 + -1.75x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + -1.75x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + -1.75x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + -1.75x + x2 = 0 + 1.375
-1.75x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
-1.75x + x2 = 1.375

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = 1.375 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = 1.375 + 0.765625

Combine like terms: 1.375 + 0.765625 = 2.140625
0.765625 + -1.75x + x2 = 2.140625

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 2.140625

Calculate the square root of the right side: 1.463087489

Break this problem into two subproblems by setting 
(x + -0.875) equal to 1.463087489 and -1.463087489.

Subproblem 1

x + -0.875 = 1.463087489 Simplifying x + -0.875 = 1.463087489 Reorder the terms: -0.875 + x = 1.463087489 Solving -0.875 + x = 1.463087489 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 1.463087489 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 1.463087489 + 0.875 x = 1.463087489 + 0.875 Combine like terms: 1.463087489 + 0.875 = 2.338087489 x = 2.338087489 Simplifying x = 2.338087489

Subproblem 2

x + -0.875 = -1.463087489 Simplifying x + -0.875 = -1.463087489 Reorder the terms: -0.875 + x = -1.463087489 Solving -0.875 + x = -1.463087489 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -1.463087489 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -1.463087489 + 0.875 x = -1.463087489 + 0.875 Combine like terms: -1.463087489 + 0.875 = -0.588087489 x = -0.588087489 Simplifying x = -0.588087489

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.338087489, -0.588087489}

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