b^2+16=-9b

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Solution for b^2+16=-9b equation:


Simplifying
b2 + 16 = -9b

Reorder the terms:
16 + b2 = -9b

Solving
16 + b2 = -9b

Solving for variable 'b'.

Reorder the terms:
16 + 9b + b2 = -9b + 9b

Combine like terms: -9b + 9b = 0
16 + 9b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + 9b + -16 + b2 = 0 + -16

Reorder the terms:
16 + -16 + 9b + b2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + 9b + b2 = 0 + -16
9b + b2 = 0 + -16

Combine like terms: 0 + -16 = -16
9b + b2 = -16

The b term is 9b.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9b + 20.25 + b2 = -16 + 20.25

Reorder the terms:
20.25 + 9b + b2 = -16 + 20.25

Combine like terms: -16 + 20.25 = 4.25
20.25 + 9b + b2 = 4.25

Factor a perfect square on the left side:
(b + 4.5)(b + 4.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(b + 4.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

b + 4.5 = 2.061552813 Simplifying b + 4.5 = 2.061552813 Reorder the terms: 4.5 + b = 2.061552813 Solving 4.5 + b = 2.061552813 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + b = 2.061552813 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + b = 2.061552813 + -4.5 b = 2.061552813 + -4.5 Combine like terms: 2.061552813 + -4.5 = -2.438447187 b = -2.438447187 Simplifying b = -2.438447187

Subproblem 2

b + 4.5 = -2.061552813 Simplifying b + 4.5 = -2.061552813 Reorder the terms: 4.5 + b = -2.061552813 Solving 4.5 + b = -2.061552813 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + b = -2.061552813 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + b = -2.061552813 + -4.5 b = -2.061552813 + -4.5 Combine like terms: -2.061552813 + -4.5 = -6.561552813 b = -6.561552813 Simplifying b = -6.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-2.438447187, -6.561552813}

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