15-(8+b)b=-9

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Solution for 15-(8+b)b=-9 equation:


Simplifying
15 + -1(8 + b) * b = -9

Reorder the terms for easier multiplication:
15 + -1b(8 + b) = -9
15 + (8 * -1b + b * -1b) = -9
15 + (-8b + -1b2) = -9

Solving
15 + -8b + -1b2 = -9

Solving for variable 'b'.

Reorder the terms:
15 + 9 + -8b + -1b2 = -9 + 9

Combine like terms: 15 + 9 = 24
24 + -8b + -1b2 = -9 + 9

Combine like terms: -9 + 9 = 0
24 + -8b + -1b2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-24 + 8b + b2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 8b + 24 + b2 = 0 + 24

Reorder the terms:
-24 + 24 + 8b + b2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 8b + b2 = 0 + 24
8b + b2 = 0 + 24

Combine like terms: 0 + 24 = 24
8b + b2 = 24

The b term is 8b.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8b + 16 + b2 = 24 + 16

Reorder the terms:
16 + 8b + b2 = 24 + 16

Combine like terms: 24 + 16 = 40
16 + 8b + b2 = 40

Factor a perfect square on the left side:
(b + 4)(b + 4) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(b + 4) equal to 6.32455532 and -6.32455532.

Subproblem 1

b + 4 = 6.32455532 Simplifying b + 4 = 6.32455532 Reorder the terms: 4 + b = 6.32455532 Solving 4 + b = 6.32455532 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + b = 6.32455532 + -4 Combine like terms: 4 + -4 = 0 0 + b = 6.32455532 + -4 b = 6.32455532 + -4 Combine like terms: 6.32455532 + -4 = 2.32455532 b = 2.32455532 Simplifying b = 2.32455532

Subproblem 2

b + 4 = -6.32455532 Simplifying b + 4 = -6.32455532 Reorder the terms: 4 + b = -6.32455532 Solving 4 + b = -6.32455532 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + b = -6.32455532 + -4 Combine like terms: 4 + -4 = 0 0 + b = -6.32455532 + -4 b = -6.32455532 + -4 Combine like terms: -6.32455532 + -4 = -10.32455532 b = -10.32455532 Simplifying b = -10.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.32455532, -10.32455532}

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