8v^2-8v-13=0

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Solution for 8v^2-8v-13=0 equation:


Simplifying
8v2 + -8v + -13 = 0

Reorder the terms:
-13 + -8v + 8v2 = 0

Solving
-13 + -8v + 8v2 = 0

Solving for variable 'v'.

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

Divide each side by '8'.
-1.625 + -1v + v2 = 0

Move the constant term to the right:

Add '1.625' to each side of the equation.
-1.625 + -1v + 1.625 + v2 = 0 + 1.625

Reorder the terms:
-1.625 + 1.625 + -1v + v2 = 0 + 1.625

Combine like terms: -1.625 + 1.625 = 0.000
0.000 + -1v + v2 = 0 + 1.625
-1v + v2 = 0 + 1.625

Combine like terms: 0 + 1.625 = 1.625
-1v + v2 = 1.625

The v term is -1v.  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.
-1v + 0.25 + v2 = 1.625 + 0.25

Reorder the terms:
0.25 + -1v + v2 = 1.625 + 0.25

Combine like terms: 1.625 + 0.25 = 1.875
0.25 + -1v + v2 = 1.875

Factor a perfect square on the left side:
(v + -0.5)(v + -0.5) = 1.875

Calculate the square root of the right side: 1.369306394

Break this problem into two subproblems by setting 
(v + -0.5) equal to 1.369306394 and -1.369306394.

Subproblem 1

v + -0.5 = 1.369306394 Simplifying v + -0.5 = 1.369306394 Reorder the terms: -0.5 + v = 1.369306394 Solving -0.5 + v = 1.369306394 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = 1.369306394 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = 1.369306394 + 0.5 v = 1.369306394 + 0.5 Combine like terms: 1.369306394 + 0.5 = 1.869306394 v = 1.869306394 Simplifying v = 1.869306394

Subproblem 2

v + -0.5 = -1.369306394 Simplifying v + -0.5 = -1.369306394 Reorder the terms: -0.5 + v = -1.369306394 Solving -0.5 + v = -1.369306394 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = -1.369306394 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = -1.369306394 + 0.5 v = -1.369306394 + 0.5 Combine like terms: -1.369306394 + 0.5 = -0.869306394 v = -0.869306394 Simplifying v = -0.869306394

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.869306394, -0.869306394}

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