b(4+b)=99

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Solution for b(4+b)=99 equation:


Simplifying
b(4 + b) = 99
(4 * b + b * b) = 99
(4b + b2) = 99

Solving
4b + b2 = 99

Solving for variable 'b'.

Reorder the terms:
-99 + 4b + b2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + 4b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + 4b + 99 + b2 = 0 + 99

Reorder the terms:
-99 + 99 + 4b + b2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + 4b + b2 = 0 + 99
4b + b2 = 0 + 99

Combine like terms: 0 + 99 = 99
4b + b2 = 99

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 = 99 + 4

Reorder the terms:
4 + 4b + b2 = 99 + 4

Combine like terms: 99 + 4 = 103
4 + 4b + b2 = 103

Factor a perfect square on the left side:
(b + 2)(b + 2) = 103

Calculate the square root of the right side: 10.148891565

Break this problem into two subproblems by setting 
(b + 2) equal to 10.148891565 and -10.148891565.

Subproblem 1

b + 2 = 10.148891565 Simplifying b + 2 = 10.148891565 Reorder the terms: 2 + b = 10.148891565 Solving 2 + b = 10.148891565 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 = 10.148891565 + -2 Combine like terms: 2 + -2 = 0 0 + b = 10.148891565 + -2 b = 10.148891565 + -2 Combine like terms: 10.148891565 + -2 = 8.148891565 b = 8.148891565 Simplifying b = 8.148891565

Subproblem 2

b + 2 = -10.148891565 Simplifying b + 2 = -10.148891565 Reorder the terms: 2 + b = -10.148891565 Solving 2 + b = -10.148891565 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 = -10.148891565 + -2 Combine like terms: 2 + -2 = 0 0 + b = -10.148891565 + -2 b = -10.148891565 + -2 Combine like terms: -10.148891565 + -2 = -12.148891565 b = -12.148891565 Simplifying b = -12.148891565

Solution

The solution to the problem is based on the solutions from the subproblems. b = {8.148891565, -12.148891565}

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