-b^2-2b+1=0

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Solution for -b^2-2b+1=0 equation:


Simplifying
-1b2 + -2b + 1 = 0

Reorder the terms:
1 + -2b + -1b2 = 0

Solving
1 + -2b + -1b2 = 0

Solving for variable 'b'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1 + 2b + b2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 2b + 1 + b2 = 0 + 1

Reorder the terms:
-1 + 1 + 2b + b2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 2b + b2 = 0 + 1
2b + b2 = 0 + 1

Combine like terms: 0 + 1 = 1
2b + b2 = 1

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 = 1 + 1

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

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

Factor a perfect square on the left side:
(b + 1)(b + 1) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(b + 1) equal to 1.414213562 and -1.414213562.

Subproblem 1

b + 1 = 1.414213562 Simplifying b + 1 = 1.414213562 Reorder the terms: 1 + b = 1.414213562 Solving 1 + b = 1.414213562 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 = 1.414213562 + -1 Combine like terms: 1 + -1 = 0 0 + b = 1.414213562 + -1 b = 1.414213562 + -1 Combine like terms: 1.414213562 + -1 = 0.414213562 b = 0.414213562 Simplifying b = 0.414213562

Subproblem 2

b + 1 = -1.414213562 Simplifying b + 1 = -1.414213562 Reorder the terms: 1 + b = -1.414213562 Solving 1 + b = -1.414213562 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 = -1.414213562 + -1 Combine like terms: 1 + -1 = 0 0 + b = -1.414213562 + -1 b = -1.414213562 + -1 Combine like terms: -1.414213562 + -1 = -2.414213562 b = -2.414213562 Simplifying b = -2.414213562

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.414213562, -2.414213562}

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