2b^2-9=12b

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Solution for 2b^2-9=12b equation:


Simplifying
2b2 + -9 = 12b

Reorder the terms:
-9 + 2b2 = 12b

Solving
-9 + 2b2 = 12b

Solving for variable 'b'.

Reorder the terms:
-9 + -12b + 2b2 = 12b + -12b

Combine like terms: 12b + -12b = 0
-9 + -12b + 2b2 = 0

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

Divide each side by '2'.
-4.5 + -6b + b2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -6b + 4.5 + b2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -6b + b2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -6b + b2 = 0 + 4.5
-6b + b2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-6b + b2 = 4.5

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 = 4.5 + 9

Reorder the terms:
9 + -6b + b2 = 4.5 + 9

Combine like terms: 4.5 + 9 = 13.5
9 + -6b + b2 = 13.5

Factor a perfect square on the left side:
(b + -3)(b + -3) = 13.5

Calculate the square root of the right side: 3.674234614

Break this problem into two subproblems by setting 
(b + -3) equal to 3.674234614 and -3.674234614.

Subproblem 1

b + -3 = 3.674234614 Simplifying b + -3 = 3.674234614 Reorder the terms: -3 + b = 3.674234614 Solving -3 + b = 3.674234614 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 = 3.674234614 + 3 Combine like terms: -3 + 3 = 0 0 + b = 3.674234614 + 3 b = 3.674234614 + 3 Combine like terms: 3.674234614 + 3 = 6.674234614 b = 6.674234614 Simplifying b = 6.674234614

Subproblem 2

b + -3 = -3.674234614 Simplifying b + -3 = -3.674234614 Reorder the terms: -3 + b = -3.674234614 Solving -3 + b = -3.674234614 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 = -3.674234614 + 3 Combine like terms: -3 + 3 = 0 0 + b = -3.674234614 + 3 b = -3.674234614 + 3 Combine like terms: -3.674234614 + 3 = -0.674234614 b = -0.674234614 Simplifying b = -0.674234614

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.674234614, -0.674234614}

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