b^2+7b+4=0

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Solution for b^2+7b+4=0 equation: 


Simplifying
b2 + 7b + 4 = 0

Reorder the terms:
4 + 7b + b2 = 0

Solving
4 + 7b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 7b + -4 + b2 = 0 + -4

Reorder the terms:
4 + -4 + 7b + b2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 7b + b2 = 0 + -4
7b + b2 = 0 + -4

Combine like terms: 0 + -4 = -4
7b + b2 = -4

The b term is 7b.  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.
7b + 12.25 + b2 = -4 + 12.25

Reorder the terms:
12.25 + 7b + b2 = -4 + 12.25

Combine like terms: -4 + 12.25 = 8.25
12.25 + 7b + b2 = 8.25

Factor a perfect square on the left side:
(b + 3.5)(b + 3.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(b + 3.5) equal to 2.872281323 and -2.872281323.


Subproblem 1
b + 3.5 = 2.872281323

Simplifying
b + 3.5 = 2.872281323

Reorder the terms:
3.5 + b = 2.872281323

Solving
3.5 + b = 2.872281323

Solving for variable 'b'.

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

Add '-3.5' to each side of the equation.
3.5 + -3.5 + b = 2.872281323 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + b = 2.872281323 + -3.5
b = 2.872281323 + -3.5

Combine like terms: 2.872281323 + -3.5 = -0.627718677
b = -0.627718677

Simplifying
b = -0.627718677


Subproblem 2
b + 3.5 = -2.872281323

Simplifying
b + 3.5 = -2.872281323

Reorder the terms:
3.5 + b = -2.872281323

Solving
3.5 + b = -2.872281323

Solving for variable 'b'.

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

Add '-3.5' to each side of the equation.
3.5 + -3.5 + b = -2.872281323 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + b = -2.872281323 + -3.5
b = -2.872281323 + -3.5

Combine like terms: -2.872281323 + -3.5 = -6.372281323
b = -6.372281323

Simplifying
b = -6.372281323


Solution
The solution to the problem is based on the solutions
from the subproblems.
b = {-0.627718677, -6.372281323}

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