5d^2+5d-6=0

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


Simplifying
5d2 + 5d + -6 = 0

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

Solving
-6 + 5d + 5d2 = 0

Solving for variable 'd'.

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

Divide each side by '5'.
-1.2 + d + d2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + d + 1.2 + d2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + d + d2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + d + d2 = 0 + 1.2
d + d2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
d + d2 = 1.2

The d term is d.  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.
 + 0.25 + d2 = 1.2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + d2 = 1.2 + 0.25

Combine like terms: 1.2 + 0.25 = 1.45
1.25 + d2 = 1.45

Factor a perfect square on the left side:
(d + 0.5)(d + 0.5) = 1.45

Calculate the square root of the right side: 1.204159458

Break this problem into two subproblems by setting 
(d + 0.5) equal to 1.204159458 and -1.204159458.

Subproblem 1

d + 0.5 = 1.204159458 Simplifying d + 0.5 = 1.204159458 Reorder the terms: 0.5 + d = 1.204159458 Solving 0.5 + d = 1.204159458 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 = 1.204159458 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + d = 1.204159458 + -0.5 d = 1.204159458 + -0.5 Combine like terms: 1.204159458 + -0.5 = 0.704159458 d = 0.704159458 Simplifying d = 0.704159458

Subproblem 2

d + 0.5 = -1.204159458 Simplifying d + 0.5 = -1.204159458 Reorder the terms: 0.5 + d = -1.204159458 Solving 0.5 + d = -1.204159458 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 = -1.204159458 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + d = -1.204159458 + -0.5 d = -1.204159458 + -0.5 Combine like terms: -1.204159458 + -0.5 = -1.704159458 d = -1.704159458 Simplifying d = -1.704159458

Solution

The solution to the problem is based on the solutions from the subproblems. d = {0.704159458, -1.704159458}

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