0=b^2+15b-12536

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Solution for 0=b^2+15b-12536 equation:


Simplifying
0 = b2 + 15b + -12536

Reorder the terms:
0 = -12536 + 15b + b2

Solving
0 = -12536 + 15b + b2

Solving for variable 'b'.

Combine like terms: 0 + 12536 = 12536
12536 + -15b + -1b2 = -12536 + 15b + b2 + 12536 + -15b + -1b2

Reorder the terms:
12536 + -15b + -1b2 = -12536 + 12536 + 15b + -15b + b2 + -1b2

Combine like terms: -12536 + 12536 = 0
12536 + -15b + -1b2 = 0 + 15b + -15b + b2 + -1b2
12536 + -15b + -1b2 = 15b + -15b + b2 + -1b2

Combine like terms: 15b + -15b = 0
12536 + -15b + -1b2 = 0 + b2 + -1b2
12536 + -15b + -1b2 = b2 + -1b2

Combine like terms: b2 + -1b2 = 0
12536 + -15b + -1b2 = 0

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

Divide each side by '-1'.
-12536 + 15b + b2 = 0

Move the constant term to the right:

Add '12536' to each side of the equation.
-12536 + 15b + 12536 + b2 = 0 + 12536

Reorder the terms:
-12536 + 12536 + 15b + b2 = 0 + 12536

Combine like terms: -12536 + 12536 = 0
0 + 15b + b2 = 0 + 12536
15b + b2 = 0 + 12536

Combine like terms: 0 + 12536 = 12536
15b + b2 = 12536

The b term is 15b.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15b + 56.25 + b2 = 12536 + 56.25

Reorder the terms:
56.25 + 15b + b2 = 12536 + 56.25

Combine like terms: 12536 + 56.25 = 12592.25
56.25 + 15b + b2 = 12592.25

Factor a perfect square on the left side:
(b + 7.5)(b + 7.5) = 12592.25

Calculate the square root of the right side: 112.21519505

Break this problem into two subproblems by setting 
(b + 7.5) equal to 112.21519505 and -112.21519505.

Subproblem 1

b + 7.5 = 112.21519505 Simplifying b + 7.5 = 112.21519505 Reorder the terms: 7.5 + b = 112.21519505 Solving 7.5 + b = 112.21519505 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + b = 112.21519505 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + b = 112.21519505 + -7.5 b = 112.21519505 + -7.5 Combine like terms: 112.21519505 + -7.5 = 104.71519505 b = 104.71519505 Simplifying b = 104.71519505

Subproblem 2

b + 7.5 = -112.21519505 Simplifying b + 7.5 = -112.21519505 Reorder the terms: 7.5 + b = -112.21519505 Solving 7.5 + b = -112.21519505 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + b = -112.21519505 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + b = -112.21519505 + -7.5 b = -112.21519505 + -7.5 Combine like terms: -112.21519505 + -7.5 = -119.71519505 b = -119.71519505 Simplifying b = -119.71519505

Solution

The solution to the problem is based on the solutions from the subproblems. b = {104.71519505, -119.71519505}

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