9(2b+1)2b=29

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Solution for 9(2b+1)2b=29 equation:


Simplifying
9(2b + 1) * 2b = 29

Reorder the terms:
9(1 + 2b) * 2b = 29

Reorder the terms for easier multiplication:
9 * 2b(1 + 2b) = 29

Multiply 9 * 2
18b(1 + 2b) = 29
(1 * 18b + 2b * 18b) = 29
(18b + 36b2) = 29

Solving
18b + 36b2 = 29

Solving for variable 'b'.

Reorder the terms:
-29 + 18b + 36b2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 18b + 36b2 = 0

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

Divide each side by '36'.
-0.8055555556 + 0.5b + b2 = 0

Move the constant term to the right:

Add '0.8055555556' to each side of the equation.
-0.8055555556 + 0.5b + 0.8055555556 + b2 = 0 + 0.8055555556

Reorder the terms:
-0.8055555556 + 0.8055555556 + 0.5b + b2 = 0 + 0.8055555556

Combine like terms: -0.8055555556 + 0.8055555556 = 0.0000000000
0.0000000000 + 0.5b + b2 = 0 + 0.8055555556
0.5b + b2 = 0 + 0.8055555556

Combine like terms: 0 + 0.8055555556 = 0.8055555556
0.5b + b2 = 0.8055555556

The b term is 0.5b.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5b + 0.0625 + b2 = 0.8055555556 + 0.0625

Reorder the terms:
0.0625 + 0.5b + b2 = 0.8055555556 + 0.0625

Combine like terms: 0.8055555556 + 0.0625 = 0.8680555556
0.0625 + 0.5b + b2 = 0.8680555556

Factor a perfect square on the left side:
(b + 0.25)(b + 0.25) = 0.8680555556

Calculate the square root of the right side: 0.931694991

Break this problem into two subproblems by setting 
(b + 0.25) equal to 0.931694991 and -0.931694991.

Subproblem 1

b + 0.25 = 0.931694991 Simplifying b + 0.25 = 0.931694991 Reorder the terms: 0.25 + b = 0.931694991 Solving 0.25 + b = 0.931694991 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + b = 0.931694991 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + b = 0.931694991 + -0.25 b = 0.931694991 + -0.25 Combine like terms: 0.931694991 + -0.25 = 0.681694991 b = 0.681694991 Simplifying b = 0.681694991

Subproblem 2

b + 0.25 = -0.931694991 Simplifying b + 0.25 = -0.931694991 Reorder the terms: 0.25 + b = -0.931694991 Solving 0.25 + b = -0.931694991 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + b = -0.931694991 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + b = -0.931694991 + -0.25 b = -0.931694991 + -0.25 Combine like terms: -0.931694991 + -0.25 = -1.181694991 b = -1.181694991 Simplifying b = -1.181694991

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.681694991, -1.181694991}

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