(b-1)+b(b+2)=11

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Solution for (b-1)+b(b+2)=11 equation:


Simplifying
(b + -1) + b(b + 2) = 11

Reorder the terms:
(-1 + b) + b(b + 2) = 11

Remove parenthesis around (-1 + b)
-1 + b + b(b + 2) = 11

Reorder the terms:
-1 + b + b(2 + b) = 11
-1 + b + (2 * b + b * b) = 11
-1 + b + (2b + b2) = 11

Combine like terms: b + 2b = 3b
-1 + 3b + b2 = 11

Solving
-1 + 3b + b2 = 11

Solving for variable 'b'.

Reorder the terms:
-1 + -11 + 3b + b2 = 11 + -11

Combine like terms: -1 + -11 = -12
-12 + 3b + b2 = 11 + -11

Combine like terms: 11 + -11 = 0
-12 + 3b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 3b + 12 + b2 = 0 + 12

Reorder the terms:
-12 + 12 + 3b + b2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 3b + b2 = 0 + 12
3b + b2 = 0 + 12

Combine like terms: 0 + 12 = 12
3b + b2 = 12

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 = 12 + 2.25

Reorder the terms:
2.25 + 3b + b2 = 12 + 2.25

Combine like terms: 12 + 2.25 = 14.25
2.25 + 3b + b2 = 14.25

Factor a perfect square on the left side:
(b + 1.5)(b + 1.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(b + 1.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

b + 1.5 = 3.774917218 Simplifying b + 1.5 = 3.774917218 Reorder the terms: 1.5 + b = 3.774917218 Solving 1.5 + b = 3.774917218 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 = 3.774917218 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = 3.774917218 + -1.5 b = 3.774917218 + -1.5 Combine like terms: 3.774917218 + -1.5 = 2.274917218 b = 2.274917218 Simplifying b = 2.274917218

Subproblem 2

b + 1.5 = -3.774917218 Simplifying b + 1.5 = -3.774917218 Reorder the terms: 1.5 + b = -3.774917218 Solving 1.5 + b = -3.774917218 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 = -3.774917218 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = -3.774917218 + -1.5 b = -3.774917218 + -1.5 Combine like terms: -3.774917218 + -1.5 = -5.274917218 b = -5.274917218 Simplifying b = -5.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.274917218, -5.274917218}

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