b^2+12b-86=10

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Solution for b^2+12b-86=10 equation:


Simplifying
b2 + 12b + -86 = 10

Reorder the terms:
-86 + 12b + b2 = 10

Solving
-86 + 12b + b2 = 10

Solving for variable 'b'.

Reorder the terms:
-86 + -10 + 12b + b2 = 10 + -10

Combine like terms: -86 + -10 = -96
-96 + 12b + b2 = 10 + -10

Combine like terms: 10 + -10 = 0
-96 + 12b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '96' to each side of the equation.
-96 + 12b + 96 + b2 = 0 + 96

Reorder the terms:
-96 + 96 + 12b + b2 = 0 + 96

Combine like terms: -96 + 96 = 0
0 + 12b + b2 = 0 + 96
12b + b2 = 0 + 96

Combine like terms: 0 + 96 = 96
12b + b2 = 96

The b term is 12b.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12b + 36 + b2 = 96 + 36

Reorder the terms:
36 + 12b + b2 = 96 + 36

Combine like terms: 96 + 36 = 132
36 + 12b + b2 = 132

Factor a perfect square on the left side:
(b + 6)(b + 6) = 132

Calculate the square root of the right side: 11.489125293

Break this problem into two subproblems by setting 
(b + 6) equal to 11.489125293 and -11.489125293.

Subproblem 1

b + 6 = 11.489125293 Simplifying b + 6 = 11.489125293 Reorder the terms: 6 + b = 11.489125293 Solving 6 + b = 11.489125293 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + b = 11.489125293 + -6 Combine like terms: 6 + -6 = 0 0 + b = 11.489125293 + -6 b = 11.489125293 + -6 Combine like terms: 11.489125293 + -6 = 5.489125293 b = 5.489125293 Simplifying b = 5.489125293

Subproblem 2

b + 6 = -11.489125293 Simplifying b + 6 = -11.489125293 Reorder the terms: 6 + b = -11.489125293 Solving 6 + b = -11.489125293 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + b = -11.489125293 + -6 Combine like terms: 6 + -6 = 0 0 + b = -11.489125293 + -6 b = -11.489125293 + -6 Combine like terms: -11.489125293 + -6 = -17.489125293 b = -17.489125293 Simplifying b = -17.489125293

Solution

The solution to the problem is based on the solutions from the subproblems. b = {5.489125293, -17.489125293}

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