d^2+7d+7=0

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Solution for d^2+7d+7=0 equation: 


Simplifying
d2 + 7d + 7 = 0

Reorder the terms:
7 + 7d + d2 = 0

Solving
7 + 7d + d2 = 0

Solving for variable 'd'.

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + 7d + -7 + d2 = 0 + -7

Reorder the terms:
7 + -7 + 7d + d2 = 0 + -7

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

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

The d term is 7d.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7d + 12.25 + d2 = -7 + 12.25

Reorder the terms:
12.25 + 7d + d2 = -7 + 12.25

Combine like terms: -7 + 12.25 = 5.25
12.25 + 7d + d2 = 5.25

Factor a perfect square on the left side:
(d + 3.5)(d + 3.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(d + 3.5) equal to 2.291287847 and -2.291287847.


Subproblem 1
d + 3.5 = 2.291287847

Simplifying
d + 3.5 = 2.291287847

Reorder the terms:
3.5 + d = 2.291287847

Solving
3.5 + d = 2.291287847

Solving for variable 'd'.

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

Add '-3.5' to each side of the equation.
3.5 + -3.5 + d = 2.291287847 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + d = 2.291287847 + -3.5
d = 2.291287847 + -3.5

Combine like terms: 2.291287847 + -3.5 = -1.208712153
d = -1.208712153

Simplifying
d = -1.208712153


Subproblem 2
d + 3.5 = -2.291287847

Simplifying
d + 3.5 = -2.291287847

Reorder the terms:
3.5 + d = -2.291287847

Solving
3.5 + d = -2.291287847

Solving for variable 'd'.

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

Add '-3.5' to each side of the equation.
3.5 + -3.5 + d = -2.291287847 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + d = -2.291287847 + -3.5
d = -2.291287847 + -3.5

Combine like terms: -2.291287847 + -3.5 = -5.791287847
d = -5.791287847

Simplifying
d = -5.791287847


Solution
The solution to the problem is based on the solutions
from the subproblems.
d = {-1.208712153, -5.791287847}

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