3b^2-12b=-4

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Solution for 3b^2-12b=-4 equation:


Simplifying
3b2 + -12b = -4

Reorder the terms:
-12b + 3b2 = -4

Solving
-12b + 3b2 = -4

Solving for variable 'b'.

Reorder the terms:
4 + -12b + 3b2 = -4 + 4

Combine like terms: -4 + 4 = 0
4 + -12b + 3b2 = 0

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

Divide each side by '3'.
1.333333333 + -4b + b2 = 0

Move the constant term to the right:

Add '-1.333333333' to each side of the equation.
1.333333333 + -4b + -1.333333333 + b2 = 0 + -1.333333333

Reorder the terms:
1.333333333 + -1.333333333 + -4b + b2 = 0 + -1.333333333

Combine like terms: 1.333333333 + -1.333333333 = 0.000000000
0.000000000 + -4b + b2 = 0 + -1.333333333
-4b + b2 = 0 + -1.333333333

Combine like terms: 0 + -1.333333333 = -1.333333333
-4b + b2 = -1.333333333

The b term is -4b.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4b + 4 + b2 = -1.333333333 + 4

Reorder the terms:
4 + -4b + b2 = -1.333333333 + 4

Combine like terms: -1.333333333 + 4 = 2.666666667
4 + -4b + b2 = 2.666666667

Factor a perfect square on the left side:
(b + -2)(b + -2) = 2.666666667

Calculate the square root of the right side: 1.632993162

Break this problem into two subproblems by setting 
(b + -2) equal to 1.632993162 and -1.632993162.

Subproblem 1

b + -2 = 1.632993162 Simplifying b + -2 = 1.632993162 Reorder the terms: -2 + b = 1.632993162 Solving -2 + b = 1.632993162 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = 1.632993162 + 2 Combine like terms: -2 + 2 = 0 0 + b = 1.632993162 + 2 b = 1.632993162 + 2 Combine like terms: 1.632993162 + 2 = 3.632993162 b = 3.632993162 Simplifying b = 3.632993162

Subproblem 2

b + -2 = -1.632993162 Simplifying b + -2 = -1.632993162 Reorder the terms: -2 + b = -1.632993162 Solving -2 + b = -1.632993162 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = -1.632993162 + 2 Combine like terms: -2 + 2 = 0 0 + b = -1.632993162 + 2 b = -1.632993162 + 2 Combine like terms: -1.632993162 + 2 = 0.367006838 b = 0.367006838 Simplifying b = 0.367006838

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.632993162, 0.367006838}

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