1.5b(b+2)=2b-9+15

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Solution for 1.5b(b+2)=2b-9+15 equation:


Simplifying
1.5b(b + 2) = 2b + -9 + 15

Reorder the terms:
1.5b(2 + b) = 2b + -9 + 15
(2 * 1.5b + b * 1.5b) = 2b + -9 + 15
(3b + 1.5b2) = 2b + -9 + 15

Reorder the terms:
3b + 1.5b2 = -9 + 15 + 2b

Combine like terms: -9 + 15 = 6
3b + 1.5b2 = 6 + 2b

Solving
3b + 1.5b2 = 6 + 2b

Solving for variable 'b'.

Reorder the terms:
-6 + 3b + -2b + 1.5b2 = 6 + 2b + -6 + -2b

Combine like terms: 3b + -2b = 1b
-6 + 1b + 1.5b2 = 6 + 2b + -6 + -2b

Reorder the terms:
-6 + 1b + 1.5b2 = 6 + -6 + 2b + -2b

Combine like terms: 6 + -6 = 0
-6 + 1b + 1.5b2 = 0 + 2b + -2b
-6 + 1b + 1.5b2 = 2b + -2b

Combine like terms: 2b + -2b = 0
-6 + 1b + 1.5b2 = 0

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

Divide each side by '1.5'.
-4 + 0.6666666667b + b2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 0.6666666667b + 4 + b2 = 0 + 4

Reorder the terms:
-4 + 4 + 0.6666666667b + b2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.6666666667b + b2 = 0 + 4
0.6666666667b + b2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.6666666667b + b2 = 4

The b term is 0.6666666667b.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667b + 0.1111111112 + b2 = 4 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667b + b2 = 4 + 0.1111111112

Combine like terms: 4 + 0.1111111112 = 4.1111111112
0.1111111112 + 0.6666666667b + b2 = 4.1111111112

Factor a perfect square on the left side:
(b + 0.3333333334)(b + 0.3333333334) = 4.1111111112

Calculate the square root of the right side: 2.02758751

Break this problem into two subproblems by setting 
(b + 0.3333333334) equal to 2.02758751 and -2.02758751.

Subproblem 1

b + 0.3333333334 = 2.02758751 Simplifying b + 0.3333333334 = 2.02758751 Reorder the terms: 0.3333333334 + b = 2.02758751 Solving 0.3333333334 + b = 2.02758751 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + b = 2.02758751 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + b = 2.02758751 + -0.3333333334 b = 2.02758751 + -0.3333333334 Combine like terms: 2.02758751 + -0.3333333334 = 1.6942541766 b = 1.6942541766 Simplifying b = 1.6942541766

Subproblem 2

b + 0.3333333334 = -2.02758751 Simplifying b + 0.3333333334 = -2.02758751 Reorder the terms: 0.3333333334 + b = -2.02758751 Solving 0.3333333334 + b = -2.02758751 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + b = -2.02758751 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + b = -2.02758751 + -0.3333333334 b = -2.02758751 + -0.3333333334 Combine like terms: -2.02758751 + -0.3333333334 = -2.3609208434 b = -2.3609208434 Simplifying b = -2.3609208434

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.6942541766, -2.3609208434}

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