b^2+9b-384=0

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Solution for b^2+9b-384=0 equation:


Simplifying
b2 + 9b + -384 = 0

Reorder the terms:
-384 + 9b + b2 = 0

Solving
-384 + 9b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '384' to each side of the equation.
-384 + 9b + 384 + b2 = 0 + 384

Reorder the terms:
-384 + 384 + 9b + b2 = 0 + 384

Combine like terms: -384 + 384 = 0
0 + 9b + b2 = 0 + 384
9b + b2 = 0 + 384

Combine like terms: 0 + 384 = 384
9b + b2 = 384

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 = 384 + 20.25

Reorder the terms:
20.25 + 9b + b2 = 384 + 20.25

Combine like terms: 384 + 20.25 = 404.25
20.25 + 9b + b2 = 404.25

Factor a perfect square on the left side:
(b + 4.5)(b + 4.5) = 404.25

Calculate the square root of the right side: 20.105969263

Break this problem into two subproblems by setting 
(b + 4.5) equal to 20.105969263 and -20.105969263.

Subproblem 1

b + 4.5 = 20.105969263 Simplifying b + 4.5 = 20.105969263 Reorder the terms: 4.5 + b = 20.105969263 Solving 4.5 + b = 20.105969263 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 = 20.105969263 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + b = 20.105969263 + -4.5 b = 20.105969263 + -4.5 Combine like terms: 20.105969263 + -4.5 = 15.605969263 b = 15.605969263 Simplifying b = 15.605969263

Subproblem 2

b + 4.5 = -20.105969263 Simplifying b + 4.5 = -20.105969263 Reorder the terms: 4.5 + b = -20.105969263 Solving 4.5 + b = -20.105969263 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 = -20.105969263 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + b = -20.105969263 + -4.5 b = -20.105969263 + -4.5 Combine like terms: -20.105969263 + -4.5 = -24.605969263 b = -24.605969263 Simplifying b = -24.605969263

Solution

The solution to the problem is based on the solutions from the subproblems. b = {15.605969263, -24.605969263}

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