0=8x^2+14x-13

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Solution for 0=8x^2+14x-13 equation:


Simplifying
0 = 8x2 + 14x + -13

Reorder the terms:
0 = -13 + 14x + 8x2

Solving
0 = -13 + 14x + 8x2

Solving for variable 'x'.

Combine like terms: 0 + 13 = 13
13 + -14x + -8x2 = -13 + 14x + 8x2 + 13 + -14x + -8x2

Reorder the terms:
13 + -14x + -8x2 = -13 + 13 + 14x + -14x + 8x2 + -8x2

Combine like terms: -13 + 13 = 0
13 + -14x + -8x2 = 0 + 14x + -14x + 8x2 + -8x2
13 + -14x + -8x2 = 14x + -14x + 8x2 + -8x2

Combine like terms: 14x + -14x = 0
13 + -14x + -8x2 = 0 + 8x2 + -8x2
13 + -14x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
13 + -14x + -8x2 = 0

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

Divide each side by '-8'.
-1.625 + 1.75x + x2 = 0

Move the constant term to the right:

Add '1.625' to each side of the equation.
-1.625 + 1.75x + 1.625 + x2 = 0 + 1.625

Reorder the terms:
-1.625 + 1.625 + 1.75x + x2 = 0 + 1.625

Combine like terms: -1.625 + 1.625 = 0.000
0.000 + 1.75x + x2 = 0 + 1.625
1.75x + x2 = 0 + 1.625

Combine like terms: 0 + 1.625 = 1.625
1.75x + x2 = 1.625

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 = 1.625 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 1.625 + 0.765625

Combine like terms: 1.625 + 0.765625 = 2.390625
0.765625 + 1.75x + x2 = 2.390625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(x + 0.875) equal to 1.54616461 and -1.54616461.

Subproblem 1

x + 0.875 = 1.54616461 Simplifying x + 0.875 = 1.54616461 Reorder the terms: 0.875 + x = 1.54616461 Solving 0.875 + x = 1.54616461 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 = 1.54616461 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 1.54616461 + -0.875 x = 1.54616461 + -0.875 Combine like terms: 1.54616461 + -0.875 = 0.67116461 x = 0.67116461 Simplifying x = 0.67116461

Subproblem 2

x + 0.875 = -1.54616461 Simplifying x + 0.875 = -1.54616461 Reorder the terms: 0.875 + x = -1.54616461 Solving 0.875 + x = -1.54616461 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 = -1.54616461 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -1.54616461 + -0.875 x = -1.54616461 + -0.875 Combine like terms: -1.54616461 + -0.875 = -2.42116461 x = -2.42116461 Simplifying x = -2.42116461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.67116461, -2.42116461}

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