2d^2-2d-675=0

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Solution for 2d^2-2d-675=0 equation:


Simplifying
2d2 + -2d + -675 = 0

Reorder the terms:
-675 + -2d + 2d2 = 0

Solving
-675 + -2d + 2d2 = 0

Solving for variable 'd'.

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

Divide each side by '2'.
-337.5 + -1d + d2 = 0

Move the constant term to the right:

Add '337.5' to each side of the equation.
-337.5 + -1d + 337.5 + d2 = 0 + 337.5

Reorder the terms:
-337.5 + 337.5 + -1d + d2 = 0 + 337.5

Combine like terms: -337.5 + 337.5 = 0.0
0.0 + -1d + d2 = 0 + 337.5
-1d + d2 = 0 + 337.5

Combine like terms: 0 + 337.5 = 337.5
-1d + d2 = 337.5

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 = 337.5 + 0.25

Reorder the terms:
0.25 + -1d + d2 = 337.5 + 0.25

Combine like terms: 337.5 + 0.25 = 337.75
0.25 + -1d + d2 = 337.75

Factor a perfect square on the left side:
(d + -0.5)(d + -0.5) = 337.75

Calculate the square root of the right side: 18.377975949

Break this problem into two subproblems by setting 
(d + -0.5) equal to 18.377975949 and -18.377975949.

Subproblem 1

d + -0.5 = 18.377975949 Simplifying d + -0.5 = 18.377975949 Reorder the terms: -0.5 + d = 18.377975949 Solving -0.5 + d = 18.377975949 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 = 18.377975949 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + d = 18.377975949 + 0.5 d = 18.377975949 + 0.5 Combine like terms: 18.377975949 + 0.5 = 18.877975949 d = 18.877975949 Simplifying d = 18.877975949

Subproblem 2

d + -0.5 = -18.377975949 Simplifying d + -0.5 = -18.377975949 Reorder the terms: -0.5 + d = -18.377975949 Solving -0.5 + d = -18.377975949 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 = -18.377975949 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + d = -18.377975949 + 0.5 d = -18.377975949 + 0.5 Combine like terms: -18.377975949 + 0.5 = -17.877975949 d = -17.877975949 Simplifying d = -17.877975949

Solution

The solution to the problem is based on the solutions from the subproblems. d = {18.877975949, -17.877975949}

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