8v^2-10v-1=0

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Solution for 8v^2-10v-1=0 equation:


Simplifying
8v2 + -10v + -1 = 0

Reorder the terms:
-1 + -10v + 8v2 = 0

Solving
-1 + -10v + 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'.
-0.125 + -1.25v + v2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + -1.25v + 0.125 + v2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + -1.25v + v2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + -1.25v + v2 = 0 + 0.125
-1.25v + v2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
-1.25v + v2 = 0.125

The v term is -1.25v.  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.
-1.25v + 0.390625 + v2 = 0.125 + 0.390625

Reorder the terms:
0.390625 + -1.25v + v2 = 0.125 + 0.390625

Combine like terms: 0.125 + 0.390625 = 0.515625
0.390625 + -1.25v + v2 = 0.515625

Factor a perfect square on the left side:
(v + -0.625)(v + -0.625) = 0.515625

Calculate the square root of the right side: 0.718070331

Break this problem into two subproblems by setting 
(v + -0.625) equal to 0.718070331 and -0.718070331.

Subproblem 1

v + -0.625 = 0.718070331 Simplifying v + -0.625 = 0.718070331 Reorder the terms: -0.625 + v = 0.718070331 Solving -0.625 + v = 0.718070331 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + v = 0.718070331 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + v = 0.718070331 + 0.625 v = 0.718070331 + 0.625 Combine like terms: 0.718070331 + 0.625 = 1.343070331 v = 1.343070331 Simplifying v = 1.343070331

Subproblem 2

v + -0.625 = -0.718070331 Simplifying v + -0.625 = -0.718070331 Reorder the terms: -0.625 + v = -0.718070331 Solving -0.625 + v = -0.718070331 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + v = -0.718070331 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + v = -0.718070331 + 0.625 v = -0.718070331 + 0.625 Combine like terms: -0.718070331 + 0.625 = -0.093070331 v = -0.093070331 Simplifying v = -0.093070331

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.343070331, -0.093070331}

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