8d^2-8d-5=0

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Solution for 8d^2-8d-5=0 equation:


Simplifying
8d2 + -8d + -5 = 0

Reorder the terms:
-5 + -8d + 8d2 = 0

Solving
-5 + -8d + 8d2 = 0

Solving for variable 'd'.

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

Divide each side by '8'.
-0.625 + -1d + d2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -1d + 0.625 + d2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -1d + d2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -1d + d2 = 0 + 0.625
-1d + d2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-1d + d2 = 0.625

The d term is -1d.  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.
-1d + 0.25 + d2 = 0.625 + 0.25

Reorder the terms:
0.25 + -1d + d2 = 0.625 + 0.25

Combine like terms: 0.625 + 0.25 = 0.875
0.25 + -1d + d2 = 0.875

Factor a perfect square on the left side:
(d + -0.5)(d + -0.5) = 0.875

Calculate the square root of the right side: 0.935414347

Break this problem into two subproblems by setting 
(d + -0.5) equal to 0.935414347 and -0.935414347.

Subproblem 1

d + -0.5 = 0.935414347 Simplifying d + -0.5 = 0.935414347 Reorder the terms: -0.5 + d = 0.935414347 Solving -0.5 + d = 0.935414347 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + d = 0.935414347 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + d = 0.935414347 + 0.5 d = 0.935414347 + 0.5 Combine like terms: 0.935414347 + 0.5 = 1.435414347 d = 1.435414347 Simplifying d = 1.435414347

Subproblem 2

d + -0.5 = -0.935414347 Simplifying d + -0.5 = -0.935414347 Reorder the terms: -0.5 + d = -0.935414347 Solving -0.5 + d = -0.935414347 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + d = -0.935414347 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + d = -0.935414347 + 0.5 d = -0.935414347 + 0.5 Combine like terms: -0.935414347 + 0.5 = -0.435414347 d = -0.435414347 Simplifying d = -0.435414347

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.435414347, -0.435414347}

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