=b(b+3)-2

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Solution for =b(b+3)-2 equation:


Simplifying
0 = b(b + 3) + -2

Reorder the terms:
0 = b(3 + b) + -2
0 = (3 * b + b * b) + -2
0 = (3b + b2) + -2

Reorder the terms:
0 = -2 + 3b + b2

Solving
0 = -2 + 3b + b2

Solving for variable 'b'.

Combine like terms: 0 + 2 = 2
2 + -3b + -1b2 = -2 + 3b + b2 + 2 + -3b + -1b2

Reorder the terms:
2 + -3b + -1b2 = -2 + 2 + 3b + -3b + b2 + -1b2

Combine like terms: -2 + 2 = 0
2 + -3b + -1b2 = 0 + 3b + -3b + b2 + -1b2
2 + -3b + -1b2 = 3b + -3b + b2 + -1b2

Combine like terms: 3b + -3b = 0
2 + -3b + -1b2 = 0 + b2 + -1b2
2 + -3b + -1b2 = b2 + -1b2

Combine like terms: b2 + -1b2 = 0
2 + -3b + -1b2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-2 + 3b + b2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 3b + 2 + b2 = 0 + 2

Reorder the terms:
-2 + 2 + 3b + b2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 3b + b2 = 0 + 2
3b + b2 = 0 + 2

Combine like terms: 0 + 2 = 2
3b + b2 = 2

The b term is 3b.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3b + 2.25 + b2 = 2 + 2.25

Reorder the terms:
2.25 + 3b + b2 = 2 + 2.25

Combine like terms: 2 + 2.25 = 4.25
2.25 + 3b + b2 = 4.25

Factor a perfect square on the left side:
(b + 1.5)(b + 1.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(b + 1.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

b + 1.5 = 2.061552813 Simplifying b + 1.5 = 2.061552813 Reorder the terms: 1.5 + b = 2.061552813 Solving 1.5 + b = 2.061552813 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + b = 2.061552813 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = 2.061552813 + -1.5 b = 2.061552813 + -1.5 Combine like terms: 2.061552813 + -1.5 = 0.561552813 b = 0.561552813 Simplifying b = 0.561552813

Subproblem 2

b + 1.5 = -2.061552813 Simplifying b + 1.5 = -2.061552813 Reorder the terms: 1.5 + b = -2.061552813 Solving 1.5 + b = -2.061552813 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + b = -2.061552813 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = -2.061552813 + -1.5 b = -2.061552813 + -1.5 Combine like terms: -2.061552813 + -1.5 = -3.561552813 b = -3.561552813 Simplifying b = -3.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.561552813, -3.561552813}

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