b(b+1)=8

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Solution for b(b+1)=8 equation:


Simplifying
b(b + 1) = 8

Reorder the terms:
b(1 + b) = 8
(1 * b + b * b) = 8
(1b + b2) = 8

Solving
1b + b2 = 8

Solving for variable 'b'.

Reorder the terms:
-8 + 1b + b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 1b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 1b + 8 + b2 = 0 + 8

Reorder the terms:
-8 + 8 + 1b + b2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 1b + b2 = 0 + 8
1b + b2 = 0 + 8

Combine like terms: 0 + 8 = 8
1b + b2 = 8

The b term is 1b.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
b + 0.25 + b2 = 8 + 0.25

Reorder the terms:
0.25 + b + b2 = 8 + 0.25

Combine like terms: 8 + 0.25 = 8.25
0.25 + b + b2 = 8.25

Factor a perfect square on the left side:
(b + 0.5)(b + 0.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(b + 0.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

b + 0.5 = 2.872281323 Simplifying b + 0.5 = 2.872281323 Reorder the terms: 0.5 + b = 2.872281323 Solving 0.5 + b = 2.872281323 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + b = 2.872281323 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + b = 2.872281323 + -0.5 b = 2.872281323 + -0.5 Combine like terms: 2.872281323 + -0.5 = 2.372281323 b = 2.372281323 Simplifying b = 2.372281323

Subproblem 2

b + 0.5 = -2.872281323 Simplifying b + 0.5 = -2.872281323 Reorder the terms: 0.5 + b = -2.872281323 Solving 0.5 + b = -2.872281323 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + b = -2.872281323 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + b = -2.872281323 + -0.5 b = -2.872281323 + -0.5 Combine like terms: -2.872281323 + -0.5 = -3.372281323 b = -3.372281323 Simplifying b = -3.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.372281323, -3.372281323}

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