3b^2-18b+5=15

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Solution for 3b^2-18b+5=15 equation:


Simplifying
3b2 + -18b + 5 = 15

Reorder the terms:
5 + -18b + 3b2 = 15

Solving
5 + -18b + 3b2 = 15

Solving for variable 'b'.

Reorder the terms:
5 + -15 + -18b + 3b2 = 15 + -15

Combine like terms: 5 + -15 = -10
-10 + -18b + 3b2 = 15 + -15

Combine like terms: 15 + -15 = 0
-10 + -18b + 3b2 = 0

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

Divide each side by '3'.
-3.333333333 + -6b + b2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -6b + 3.333333333 + b2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -6b + b2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -6b + b2 = 0 + 3.333333333
-6b + b2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-6b + b2 = 3.333333333

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 = 3.333333333 + 9

Reorder the terms:
9 + -6b + b2 = 3.333333333 + 9

Combine like terms: 3.333333333 + 9 = 12.333333333
9 + -6b + b2 = 12.333333333

Factor a perfect square on the left side:
(b + -3)(b + -3) = 12.333333333

Calculate the square root of the right side: 3.511884584

Break this problem into two subproblems by setting 
(b + -3) equal to 3.511884584 and -3.511884584.

Subproblem 1

b + -3 = 3.511884584 Simplifying b + -3 = 3.511884584 Reorder the terms: -3 + b = 3.511884584 Solving -3 + b = 3.511884584 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 = 3.511884584 + 3 Combine like terms: -3 + 3 = 0 0 + b = 3.511884584 + 3 b = 3.511884584 + 3 Combine like terms: 3.511884584 + 3 = 6.511884584 b = 6.511884584 Simplifying b = 6.511884584

Subproblem 2

b + -3 = -3.511884584 Simplifying b + -3 = -3.511884584 Reorder the terms: -3 + b = -3.511884584 Solving -3 + b = -3.511884584 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 = -3.511884584 + 3 Combine like terms: -3 + 3 = 0 0 + b = -3.511884584 + 3 b = -3.511884584 + 3 Combine like terms: -3.511884584 + 3 = -0.511884584 b = -0.511884584 Simplifying b = -0.511884584

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.511884584, -0.511884584}

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