8d^2-7=5d

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Solution for 8d^2-7=5d equation:


Simplifying
8d2 + -7 = 5d

Reorder the terms:
-7 + 8d2 = 5d

Solving
-7 + 8d2 = 5d

Solving for variable 'd'.

Reorder the terms:
-7 + -5d + 8d2 = 5d + -5d

Combine like terms: 5d + -5d = 0
-7 + -5d + 8d2 = 0

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

Divide each side by '8'.
-0.875 + -0.625d + d2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + -0.625d + 0.875 + d2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + -0.625d + d2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + -0.625d + d2 = 0 + 0.875
-0.625d + d2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
-0.625d + d2 = 0.875

The d term is -0.625d.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625d + 0.09765625 + d2 = 0.875 + 0.09765625

Reorder the terms:
0.09765625 + -0.625d + d2 = 0.875 + 0.09765625

Combine like terms: 0.875 + 0.09765625 = 0.97265625
0.09765625 + -0.625d + d2 = 0.97265625

Factor a perfect square on the left side:
(d + -0.3125)(d + -0.3125) = 0.97265625

Calculate the square root of the right side: 0.986233365

Break this problem into two subproblems by setting 
(d + -0.3125) equal to 0.986233365 and -0.986233365.

Subproblem 1

d + -0.3125 = 0.986233365 Simplifying d + -0.3125 = 0.986233365 Reorder the terms: -0.3125 + d = 0.986233365 Solving -0.3125 + d = 0.986233365 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + d = 0.986233365 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + d = 0.986233365 + 0.3125 d = 0.986233365 + 0.3125 Combine like terms: 0.986233365 + 0.3125 = 1.298733365 d = 1.298733365 Simplifying d = 1.298733365

Subproblem 2

d + -0.3125 = -0.986233365 Simplifying d + -0.3125 = -0.986233365 Reorder the terms: -0.3125 + d = -0.986233365 Solving -0.3125 + d = -0.986233365 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + d = -0.986233365 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + d = -0.986233365 + 0.3125 d = -0.986233365 + 0.3125 Combine like terms: -0.986233365 + 0.3125 = -0.673733365 d = -0.673733365 Simplifying d = -0.673733365

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.298733365, -0.673733365}

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