d^2+10d+8=-7

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Solution for d^2+10d+8=-7 equation: 


Simplifying
d2 + 10d + 8 = -7

Reorder the terms:
8 + 10d + d2 = -7

Solving
8 + 10d + d2 = -7

Solving for variable 'd'.

Reorder the terms:
8 + 7 + 10d + d2 = -7 + 7

Combine like terms: 8 + 7 = 15
15 + 10d + d2 = -7 + 7

Combine like terms: -7 + 7 = 0
15 + 10d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 10d + -15 + d2 = 0 + -15

Reorder the terms:
15 + -15 + 10d + d2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 10d + d2 = 0 + -15
10d + d2 = 0 + -15

Combine like terms: 0 + -15 = -15
10d + d2 = -15

The d term is 10d.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10d + 25 + d2 = -15 + 25

Reorder the terms:
25 + 10d + d2 = -15 + 25

Combine like terms: -15 + 25 = 10
25 + 10d + d2 = 10

Factor a perfect square on the left side:
(d + 5)(d + 5) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(d + 5) equal to 3.16227766 and -3.16227766.


Subproblem 1
d + 5 = 3.16227766

Simplifying
d + 5 = 3.16227766

Reorder the terms:
5 + d = 3.16227766

Solving
5 + d = 3.16227766

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + d = 3.16227766 + -5

Combine like terms: 5 + -5 = 0
0 + d = 3.16227766 + -5
d = 3.16227766 + -5

Combine like terms: 3.16227766 + -5 = -1.83772234
d = -1.83772234

Simplifying
d = -1.83772234


Subproblem 2
d + 5 = -3.16227766

Simplifying
d + 5 = -3.16227766

Reorder the terms:
5 + d = -3.16227766

Solving
5 + d = -3.16227766

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + d = -3.16227766 + -5

Combine like terms: 5 + -5 = 0
0 + d = -3.16227766 + -5
d = -3.16227766 + -5

Combine like terms: -3.16227766 + -5 = -8.16227766
d = -8.16227766

Simplifying
d = -8.16227766


Solution
The solution to the problem is based on the solutions
from the subproblems.
d = {-1.83772234, -8.16227766}

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