2d^2-5d-6=0

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Solution for 2d^2-5d-6=0 equation:


Simplifying
2d2 + -5d + -6 = 0

Reorder the terms:
-6 + -5d + 2d2 = 0

Solving
-6 + -5d + 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'.
-3 + -2.5d + d2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -2.5d + 3 + d2 = 0 + 3

Reorder the terms:
-3 + 3 + -2.5d + d2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -2.5d + d2 = 0 + 3
-2.5d + d2 = 0 + 3

Combine like terms: 0 + 3 = 3
-2.5d + d2 = 3

The d term is -2.5d.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5d + 1.5625 + d2 = 3 + 1.5625

Reorder the terms:
1.5625 + -2.5d + d2 = 3 + 1.5625

Combine like terms: 3 + 1.5625 = 4.5625
1.5625 + -2.5d + d2 = 4.5625

Factor a perfect square on the left side:
(d + -1.25)(d + -1.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(d + -1.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

d + -1.25 = 2.136000936 Simplifying d + -1.25 = 2.136000936 Reorder the terms: -1.25 + d = 2.136000936 Solving -1.25 + d = 2.136000936 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + d = 2.136000936 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + d = 2.136000936 + 1.25 d = 2.136000936 + 1.25 Combine like terms: 2.136000936 + 1.25 = 3.386000936 d = 3.386000936 Simplifying d = 3.386000936

Subproblem 2

d + -1.25 = -2.136000936 Simplifying d + -1.25 = -2.136000936 Reorder the terms: -1.25 + d = -2.136000936 Solving -1.25 + d = -2.136000936 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + d = -2.136000936 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + d = -2.136000936 + 1.25 d = -2.136000936 + 1.25 Combine like terms: -2.136000936 + 1.25 = -0.886000936 d = -0.886000936 Simplifying d = -0.886000936

Solution

The solution to the problem is based on the solutions from the subproblems. d = {3.386000936, -0.886000936}

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