8a^2-7a-5=0

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Solution for 8a^2-7a-5=0 equation:


Simplifying
8a2 + -7a + -5 = 0

Reorder the terms:
-5 + -7a + 8a2 = 0

Solving
-5 + -7a + 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'.
-0.625 + -0.875a + a2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -0.875a + 0.625 + a2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -0.875a + a2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -0.875a + a2 = 0 + 0.625
-0.875a + a2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-0.875a + a2 = 0.625

The a term is -0.875a.  Take half its coefficient (-0.4375).
Square it (0.19140625) and add it to both sides.

Add '0.19140625' to each side of the equation.
-0.875a + 0.19140625 + a2 = 0.625 + 0.19140625

Reorder the terms:
0.19140625 + -0.875a + a2 = 0.625 + 0.19140625

Combine like terms: 0.625 + 0.19140625 = 0.81640625
0.19140625 + -0.875a + a2 = 0.81640625

Factor a perfect square on the left side:
(a + -0.4375)(a + -0.4375) = 0.81640625

Calculate the square root of the right side: 0.903552018

Break this problem into two subproblems by setting 
(a + -0.4375) equal to 0.903552018 and -0.903552018.

Subproblem 1

a + -0.4375 = 0.903552018 Simplifying a + -0.4375 = 0.903552018 Reorder the terms: -0.4375 + a = 0.903552018 Solving -0.4375 + a = 0.903552018 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + a = 0.903552018 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + a = 0.903552018 + 0.4375 a = 0.903552018 + 0.4375 Combine like terms: 0.903552018 + 0.4375 = 1.341052018 a = 1.341052018 Simplifying a = 1.341052018

Subproblem 2

a + -0.4375 = -0.903552018 Simplifying a + -0.4375 = -0.903552018 Reorder the terms: -0.4375 + a = -0.903552018 Solving -0.4375 + a = -0.903552018 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + a = -0.903552018 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + a = -0.903552018 + 0.4375 a = -0.903552018 + 0.4375 Combine like terms: -0.903552018 + 0.4375 = -0.466052018 a = -0.466052018 Simplifying a = -0.466052018

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.341052018, -0.466052018}

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