1.5b(b+2)=90

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Solution for 1.5b(b+2)=90 equation:


Simplifying
1.5b(b + 2) = 90

Reorder the terms:
1.5b(2 + b) = 90
(2 * 1.5b + b * 1.5b) = 90
(3b + 1.5b2) = 90

Solving
3b + 1.5b2 = 90

Solving for variable 'b'.

Reorder the terms:
-90 + 3b + 1.5b2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + 3b + 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'.
-60 + 2b + b2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 2b + 60 + b2 = 0 + 60

Reorder the terms:
-60 + 60 + 2b + b2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 2b + b2 = 0 + 60
2b + b2 = 0 + 60

Combine like terms: 0 + 60 = 60
2b + b2 = 60

The b term is 2b.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2b + 1 + b2 = 60 + 1

Reorder the terms:
1 + 2b + b2 = 60 + 1

Combine like terms: 60 + 1 = 61
1 + 2b + b2 = 61

Factor a perfect square on the left side:
(b + 1)(b + 1) = 61

Calculate the square root of the right side: 7.810249676

Break this problem into two subproblems by setting 
(b + 1) equal to 7.810249676 and -7.810249676.

Subproblem 1

b + 1 = 7.810249676 Simplifying b + 1 = 7.810249676 Reorder the terms: 1 + b = 7.810249676 Solving 1 + b = 7.810249676 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = 7.810249676 + -1 Combine like terms: 1 + -1 = 0 0 + b = 7.810249676 + -1 b = 7.810249676 + -1 Combine like terms: 7.810249676 + -1 = 6.810249676 b = 6.810249676 Simplifying b = 6.810249676

Subproblem 2

b + 1 = -7.810249676 Simplifying b + 1 = -7.810249676 Reorder the terms: 1 + b = -7.810249676 Solving 1 + b = -7.810249676 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = -7.810249676 + -1 Combine like terms: 1 + -1 = 0 0 + b = -7.810249676 + -1 b = -7.810249676 + -1 Combine like terms: -7.810249676 + -1 = -8.810249676 b = -8.810249676 Simplifying b = -8.810249676

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.810249676, -8.810249676}

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