d^2+2d-136=0

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Solution for d^2+2d-136=0 equation:


Simplifying
d2 + 2d + -136 = 0

Reorder the terms:
-136 + 2d + d2 = 0

Solving
-136 + 2d + d2 = 0

Solving for variable 'd'.

Begin completing the square.

Move the constant term to the right:

Add '136' to each side of the equation.
-136 + 2d + 136 + d2 = 0 + 136

Reorder the terms:
-136 + 136 + 2d + d2 = 0 + 136

Combine like terms: -136 + 136 = 0
0 + 2d + d2 = 0 + 136
2d + d2 = 0 + 136

Combine like terms: 0 + 136 = 136
2d + d2 = 136

The d term is 2d.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2d + 1 + d2 = 136 + 1

Reorder the terms:
1 + 2d + d2 = 136 + 1

Combine like terms: 136 + 1 = 137
1 + 2d + d2 = 137

Factor a perfect square on the left side:
(d + 1)(d + 1) = 137

Calculate the square root of the right side: 11.704699911

Break this problem into two subproblems by setting 
(d + 1) equal to 11.704699911 and -11.704699911.

Subproblem 1

d + 1 = 11.704699911 Simplifying d + 1 = 11.704699911 Reorder the terms: 1 + d = 11.704699911 Solving 1 + d = 11.704699911 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + d = 11.704699911 + -1 Combine like terms: 1 + -1 = 0 0 + d = 11.704699911 + -1 d = 11.704699911 + -1 Combine like terms: 11.704699911 + -1 = 10.704699911 d = 10.704699911 Simplifying d = 10.704699911

Subproblem 2

d + 1 = -11.704699911 Simplifying d + 1 = -11.704699911 Reorder the terms: 1 + d = -11.704699911 Solving 1 + d = -11.704699911 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + d = -11.704699911 + -1 Combine like terms: 1 + -1 = 0 0 + d = -11.704699911 + -1 d = -11.704699911 + -1 Combine like terms: -11.704699911 + -1 = -12.704699911 d = -12.704699911 Simplifying d = -12.704699911

Solution

The solution to the problem is based on the solutions from the subproblems. d = {10.704699911, -12.704699911}

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