b^2+6b-69=2

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Solution for b^2+6b-69=2 equation:


Simplifying
b2 + 6b + -69 = 2

Reorder the terms:
-69 + 6b + b2 = 2

Solving
-69 + 6b + b2 = 2

Solving for variable 'b'.

Reorder the terms:
-69 + -2 + 6b + b2 = 2 + -2

Combine like terms: -69 + -2 = -71
-71 + 6b + b2 = 2 + -2

Combine like terms: 2 + -2 = 0
-71 + 6b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + 6b + 71 + b2 = 0 + 71

Reorder the terms:
-71 + 71 + 6b + b2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + 6b + b2 = 0 + 71
6b + b2 = 0 + 71

Combine like terms: 0 + 71 = 71
6b + b2 = 71

The b term is 6b.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6b + 9 + b2 = 71 + 9

Reorder the terms:
9 + 6b + b2 = 71 + 9

Combine like terms: 71 + 9 = 80
9 + 6b + b2 = 80

Factor a perfect square on the left side:
(b + 3)(b + 3) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(b + 3) equal to 8.94427191 and -8.94427191.

Subproblem 1

b + 3 = 8.94427191 Simplifying b + 3 = 8.94427191 Reorder the terms: 3 + b = 8.94427191 Solving 3 + b = 8.94427191 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + b = 8.94427191 + -3 Combine like terms: 3 + -3 = 0 0 + b = 8.94427191 + -3 b = 8.94427191 + -3 Combine like terms: 8.94427191 + -3 = 5.94427191 b = 5.94427191 Simplifying b = 5.94427191

Subproblem 2

b + 3 = -8.94427191 Simplifying b + 3 = -8.94427191 Reorder the terms: 3 + b = -8.94427191 Solving 3 + b = -8.94427191 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + b = -8.94427191 + -3 Combine like terms: 3 + -3 = 0 0 + b = -8.94427191 + -3 b = -8.94427191 + -3 Combine like terms: -8.94427191 + -3 = -11.94427191 b = -11.94427191 Simplifying b = -11.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. b = {5.94427191, -11.94427191}

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