b(b+6)=36

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Solution for b(b+6)=36 equation:


Simplifying
b(b + 6) = 36

Reorder the terms:
b(6 + b) = 36
(6 * b + b * b) = 36
(6b + b2) = 36

Solving
6b + b2 = 36

Solving for variable 'b'.

Reorder the terms:
-36 + 6b + b2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 6b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 6b + 36 + b2 = 0 + 36

Reorder the terms:
-36 + 36 + 6b + b2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 6b + b2 = 0 + 36
6b + b2 = 0 + 36

Combine like terms: 0 + 36 = 36
6b + b2 = 36

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 = 36 + 9

Reorder the terms:
9 + 6b + b2 = 36 + 9

Combine like terms: 36 + 9 = 45
9 + 6b + b2 = 45

Factor a perfect square on the left side:
(b + 3)(b + 3) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(b + 3) equal to 6.708203933 and -6.708203933.

Subproblem 1

b + 3 = 6.708203933 Simplifying b + 3 = 6.708203933 Reorder the terms: 3 + b = 6.708203933 Solving 3 + b = 6.708203933 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 = 6.708203933 + -3 Combine like terms: 3 + -3 = 0 0 + b = 6.708203933 + -3 b = 6.708203933 + -3 Combine like terms: 6.708203933 + -3 = 3.708203933 b = 3.708203933 Simplifying b = 3.708203933

Subproblem 2

b + 3 = -6.708203933 Simplifying b + 3 = -6.708203933 Reorder the terms: 3 + b = -6.708203933 Solving 3 + b = -6.708203933 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 = -6.708203933 + -3 Combine like terms: 3 + -3 = 0 0 + b = -6.708203933 + -3 b = -6.708203933 + -3 Combine like terms: -6.708203933 + -3 = -9.708203933 b = -9.708203933 Simplifying b = -9.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.708203933, -9.708203933}

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