(4+b)b=16

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Solution for (4+b)b=16 equation:


Simplifying
(4 + b) * b = 16

Reorder the terms for easier multiplication:
b(4 + b) = 16
(4 * b + b * b) = 16
(4b + b2) = 16

Solving
4b + b2 = 16

Solving for variable 'b'.

Reorder the terms:
-16 + 4b + b2 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + 4b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 4b + 16 + b2 = 0 + 16

Reorder the terms:
-16 + 16 + 4b + b2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 4b + b2 = 0 + 16
4b + b2 = 0 + 16

Combine like terms: 0 + 16 = 16
4b + b2 = 16

The b term is 4b.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4b + 4 + b2 = 16 + 4

Reorder the terms:
4 + 4b + b2 = 16 + 4

Combine like terms: 16 + 4 = 20
4 + 4b + b2 = 20

Factor a perfect square on the left side:
(b + 2)(b + 2) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(b + 2) equal to 4.472135955 and -4.472135955.

Subproblem 1

b + 2 = 4.472135955 Simplifying b + 2 = 4.472135955 Reorder the terms: 2 + b = 4.472135955 Solving 2 + b = 4.472135955 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + b = 4.472135955 + -2 Combine like terms: 2 + -2 = 0 0 + b = 4.472135955 + -2 b = 4.472135955 + -2 Combine like terms: 4.472135955 + -2 = 2.472135955 b = 2.472135955 Simplifying b = 2.472135955

Subproblem 2

b + 2 = -4.472135955 Simplifying b + 2 = -4.472135955 Reorder the terms: 2 + b = -4.472135955 Solving 2 + b = -4.472135955 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + b = -4.472135955 + -2 Combine like terms: 2 + -2 = 0 0 + b = -4.472135955 + -2 b = -4.472135955 + -2 Combine like terms: -4.472135955 + -2 = -6.472135955 b = -6.472135955 Simplifying b = -6.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.472135955, -6.472135955}

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