.5b(b+2)=80

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Solution for .5b(b+2)=80 equation:


Simplifying
0.5b(b + 2) = 80

Reorder the terms:
0.5b(2 + b) = 80
(2 * 0.5b + b * 0.5b) = 80
(1b + 0.5b2) = 80

Solving
1b + 0.5b2 = 80

Solving for variable 'b'.

Reorder the terms:
-80 + 1b + 0.5b2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + 1b + 0.5b2 = 0

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

Divide each side by '0.5'.
-160 + 2b + b2 = 0

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + 2b + 160 + b2 = 0 + 160

Reorder the terms:
-160 + 160 + 2b + b2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + 2b + b2 = 0 + 160
2b + b2 = 0 + 160

Combine like terms: 0 + 160 = 160
2b + b2 = 160

The b term is 2b.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2b + 1 + b2 = 160 + 1

Reorder the terms:
1 + 2b + b2 = 160 + 1

Combine like terms: 160 + 1 = 161
1 + 2b + b2 = 161

Factor a perfect square on the left side:
(b + 1)(b + 1) = 161

Calculate the square root of the right side: 12.68857754

Break this problem into two subproblems by setting 
(b + 1) equal to 12.68857754 and -12.68857754.

Subproblem 1

b + 1 = 12.68857754 Simplifying b + 1 = 12.68857754 Reorder the terms: 1 + b = 12.68857754 Solving 1 + b = 12.68857754 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = 12.68857754 + -1 Combine like terms: 1 + -1 = 0 0 + b = 12.68857754 + -1 b = 12.68857754 + -1 Combine like terms: 12.68857754 + -1 = 11.68857754 b = 11.68857754 Simplifying b = 11.68857754

Subproblem 2

b + 1 = -12.68857754 Simplifying b + 1 = -12.68857754 Reorder the terms: 1 + b = -12.68857754 Solving 1 + b = -12.68857754 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = -12.68857754 + -1 Combine like terms: 1 + -1 = 0 0 + b = -12.68857754 + -1 b = -12.68857754 + -1 Combine like terms: -12.68857754 + -1 = -13.68857754 b = -13.68857754 Simplifying b = -13.68857754

Solution

The solution to the problem is based on the solutions from the subproblems. b = {11.68857754, -13.68857754}

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