b^2+16b=-16

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Solution for b^2+16b=-16 equation:


Simplifying
b2 + 16b = -16

Reorder the terms:
16b + b2 = -16

Solving
16b + b2 = -16

Solving for variable 'b'.

Reorder the terms:
16 + 16b + b2 = -16 + 16

Combine like terms: -16 + 16 = 0
16 + 16b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + 16b + -16 + b2 = 0 + -16

Reorder the terms:
16 + -16 + 16b + b2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + 16b + b2 = 0 + -16
16b + b2 = 0 + -16

Combine like terms: 0 + -16 = -16
16b + b2 = -16

The b term is 16b.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16b + 64 + b2 = -16 + 64

Reorder the terms:
64 + 16b + b2 = -16 + 64

Combine like terms: -16 + 64 = 48
64 + 16b + b2 = 48

Factor a perfect square on the left side:
(b + 8)(b + 8) = 48

Calculate the square root of the right side: 6.92820323

Break this problem into two subproblems by setting 
(b + 8) equal to 6.92820323 and -6.92820323.

Subproblem 1

b + 8 = 6.92820323 Simplifying b + 8 = 6.92820323 Reorder the terms: 8 + b = 6.92820323 Solving 8 + b = 6.92820323 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + b = 6.92820323 + -8 Combine like terms: 8 + -8 = 0 0 + b = 6.92820323 + -8 b = 6.92820323 + -8 Combine like terms: 6.92820323 + -8 = -1.07179677 b = -1.07179677 Simplifying b = -1.07179677

Subproblem 2

b + 8 = -6.92820323 Simplifying b + 8 = -6.92820323 Reorder the terms: 8 + b = -6.92820323 Solving 8 + b = -6.92820323 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + b = -6.92820323 + -8 Combine like terms: 8 + -8 = 0 0 + b = -6.92820323 + -8 b = -6.92820323 + -8 Combine like terms: -6.92820323 + -8 = -14.92820323 b = -14.92820323 Simplifying b = -14.92820323

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-1.07179677, -14.92820323}

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