8a^2+10a-1=0

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


Simplifying
8a2 + 10a + -1 = 0

Reorder the terms:
-1 + 10a + 8a2 = 0

Solving
-1 + 10a + 8a2 = 0

Solving for variable 'a'.

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

Divide each side by '8'.
-0.125 + 1.25a + a2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + 1.25a + 0.125 + a2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + 1.25a + a2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + 1.25a + a2 = 0 + 0.125
1.25a + a2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
1.25a + a2 = 0.125

The a term is 1.25a.  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.
1.25a + 0.390625 + a2 = 0.125 + 0.390625

Reorder the terms:
0.390625 + 1.25a + a2 = 0.125 + 0.390625

Combine like terms: 0.125 + 0.390625 = 0.515625
0.390625 + 1.25a + a2 = 0.515625

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

Calculate the square root of the right side: 0.718070331

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


Subproblem 1
a + 0.625 = 0.718070331

Simplifying
a + 0.625 = 0.718070331

Reorder the terms:
0.625 + a = 0.718070331

Solving
0.625 + a = 0.718070331

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-0.625' to each side of the equation.
0.625 + -0.625 + a = 0.718070331 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + a = 0.718070331 + -0.625
a = 0.718070331 + -0.625

Combine like terms: 0.718070331 + -0.625 = 0.093070331
a = 0.093070331

Simplifying
a = 0.093070331


Subproblem 2
a + 0.625 = -0.718070331

Simplifying
a + 0.625 = -0.718070331

Reorder the terms:
0.625 + a = -0.718070331

Solving
0.625 + a = -0.718070331

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-0.625' to each side of the equation.
0.625 + -0.625 + a = -0.718070331 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + a = -0.718070331 + -0.625
a = -0.718070331 + -0.625

Combine like terms: -0.718070331 + -0.625 = -1.343070331
a = -1.343070331

Simplifying
a = -1.343070331


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

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