3b(6-b)=-22

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Solution for 3b(6-b)=-22 equation:


Simplifying
3b(6 + -1b) = -22
(6 * 3b + -1b * 3b) = -22
(18b + -3b2) = -22

Solving
18b + -3b2 = -22

Solving for variable 'b'.

Reorder the terms:
22 + 18b + -3b2 = -22 + 22

Combine like terms: -22 + 22 = 0
22 + 18b + -3b2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-7.333333333 + -6b + b2 = 0

Move the constant term to the right:

Add '7.333333333' to each side of the equation.
-7.333333333 + -6b + 7.333333333 + b2 = 0 + 7.333333333

Reorder the terms:
-7.333333333 + 7.333333333 + -6b + b2 = 0 + 7.333333333

Combine like terms: -7.333333333 + 7.333333333 = 0.000000000
0.000000000 + -6b + b2 = 0 + 7.333333333
-6b + b2 = 0 + 7.333333333

Combine like terms: 0 + 7.333333333 = 7.333333333
-6b + b2 = 7.333333333

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 = 7.333333333 + 9

Reorder the terms:
9 + -6b + b2 = 7.333333333 + 9

Combine like terms: 7.333333333 + 9 = 16.333333333
9 + -6b + b2 = 16.333333333

Factor a perfect square on the left side:
(b + -3)(b + -3) = 16.333333333

Calculate the square root of the right side: 4.041451884

Break this problem into two subproblems by setting 
(b + -3) equal to 4.041451884 and -4.041451884.

Subproblem 1

b + -3 = 4.041451884 Simplifying b + -3 = 4.041451884 Reorder the terms: -3 + b = 4.041451884 Solving -3 + b = 4.041451884 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 = 4.041451884 + 3 Combine like terms: -3 + 3 = 0 0 + b = 4.041451884 + 3 b = 4.041451884 + 3 Combine like terms: 4.041451884 + 3 = 7.041451884 b = 7.041451884 Simplifying b = 7.041451884

Subproblem 2

b + -3 = -4.041451884 Simplifying b + -3 = -4.041451884 Reorder the terms: -3 + b = -4.041451884 Solving -3 + b = -4.041451884 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 = -4.041451884 + 3 Combine like terms: -3 + 3 = 0 0 + b = -4.041451884 + 3 b = -4.041451884 + 3 Combine like terms: -4.041451884 + 3 = -1.041451884 b = -1.041451884 Simplifying b = -1.041451884

Solution

The solution to the problem is based on the solutions from the subproblems. b = {7.041451884, -1.041451884}

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