b(b-3)=12

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Solution for b(b-3)=12 equation:


Simplifying
b(b + -3) = 12

Reorder the terms:
b(-3 + b) = 12
(-3 * b + b * b) = 12
(-3b + b2) = 12

Solving
-3b + b2 = 12

Solving for variable 'b'.

Reorder the terms:
-12 + -3b + b2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -3b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -3b + 12 + b2 = 0 + 12

Reorder the terms:
-12 + 12 + -3b + b2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -3b + b2 = 0 + 12
-3b + b2 = 0 + 12

Combine like terms: 0 + 12 = 12
-3b + b2 = 12

The b term is -3b.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3b + 2.25 + b2 = 12 + 2.25

Reorder the terms:
2.25 + -3b + b2 = 12 + 2.25

Combine like terms: 12 + 2.25 = 14.25
2.25 + -3b + b2 = 14.25

Factor a perfect square on the left side:
(b + -1.5)(b + -1.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(b + -1.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

b + -1.5 = 3.774917218 Simplifying b + -1.5 = 3.774917218 Reorder the terms: -1.5 + b = 3.774917218 Solving -1.5 + b = 3.774917218 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + b = 3.774917218 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + b = 3.774917218 + 1.5 b = 3.774917218 + 1.5 Combine like terms: 3.774917218 + 1.5 = 5.274917218 b = 5.274917218 Simplifying b = 5.274917218

Subproblem 2

b + -1.5 = -3.774917218 Simplifying b + -1.5 = -3.774917218 Reorder the terms: -1.5 + b = -3.774917218 Solving -1.5 + b = -3.774917218 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + b = -3.774917218 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + b = -3.774917218 + 1.5 b = -3.774917218 + 1.5 Combine like terms: -3.774917218 + 1.5 = -2.274917218 b = -2.274917218 Simplifying b = -2.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. b = {5.274917218, -2.274917218}

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