0=(d^2)+6d-8

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Solution for 0=(d^2)+6d-8 equation:


Simplifying
0 = (d2) + 6d + -8
0 = d2 + 6d + -8

Reorder the terms:
0 = -8 + 6d + d2

Solving
0 = -8 + 6d + d2

Solving for variable 'd'.

Combine like terms: 0 + 8 = 8
8 + -6d + -1d2 = -8 + 6d + d2 + 8 + -6d + -1d2

Reorder the terms:
8 + -6d + -1d2 = -8 + 8 + 6d + -6d + d2 + -1d2

Combine like terms: -8 + 8 = 0
8 + -6d + -1d2 = 0 + 6d + -6d + d2 + -1d2
8 + -6d + -1d2 = 6d + -6d + d2 + -1d2

Combine like terms: 6d + -6d = 0
8 + -6d + -1d2 = 0 + d2 + -1d2
8 + -6d + -1d2 = d2 + -1d2

Combine like terms: d2 + -1d2 = 0
8 + -6d + -1d2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-8 + 6d + d2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 6d + 8 + d2 = 0 + 8

Reorder the terms:
-8 + 8 + 6d + d2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 6d + d2 = 0 + 8
6d + d2 = 0 + 8

Combine like terms: 0 + 8 = 8
6d + d2 = 8

The d term is 6d.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6d + 9 + d2 = 8 + 9

Reorder the terms:
9 + 6d + d2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + 6d + d2 = 17

Factor a perfect square on the left side:
(d + 3)(d + 3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(d + 3) equal to 4.123105626 and -4.123105626.

Subproblem 1

d + 3 = 4.123105626 Simplifying d + 3 = 4.123105626 Reorder the terms: 3 + d = 4.123105626 Solving 3 + d = 4.123105626 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + d = 4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + d = 4.123105626 + -3 d = 4.123105626 + -3 Combine like terms: 4.123105626 + -3 = 1.123105626 d = 1.123105626 Simplifying d = 1.123105626

Subproblem 2

d + 3 = -4.123105626 Simplifying d + 3 = -4.123105626 Reorder the terms: 3 + d = -4.123105626 Solving 3 + d = -4.123105626 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + d = -4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + d = -4.123105626 + -3 d = -4.123105626 + -3 Combine like terms: -4.123105626 + -3 = -7.123105626 d = -7.123105626 Simplifying d = -7.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.123105626, -7.123105626}

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