10b^2-1=-2b

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Solution for 10b^2-1=-2b equation:


Simplifying
10b2 + -1 = -2b

Reorder the terms:
-1 + 10b2 = -2b

Solving
-1 + 10b2 = -2b

Solving for variable 'b'.

Reorder the terms:
-1 + 2b + 10b2 = -2b + 2b

Combine like terms: -2b + 2b = 0
-1 + 2b + 10b2 = 0

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

Divide each side by '10'.
-0.1 + 0.2b + b2 = 0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + 0.2b + 0.1 + b2 = 0 + 0.1

Reorder the terms:
-0.1 + 0.1 + 0.2b + b2 = 0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + 0.2b + b2 = 0 + 0.1
0.2b + b2 = 0 + 0.1

Combine like terms: 0 + 0.1 = 0.1
0.2b + b2 = 0.1

The b term is 0.2b.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2b + 0.01 + b2 = 0.1 + 0.01

Reorder the terms:
0.01 + 0.2b + b2 = 0.1 + 0.01

Combine like terms: 0.1 + 0.01 = 0.11
0.01 + 0.2b + b2 = 0.11

Factor a perfect square on the left side:
(b + 0.1)(b + 0.1) = 0.11

Calculate the square root of the right side: 0.331662479

Break this problem into two subproblems by setting 
(b + 0.1) equal to 0.331662479 and -0.331662479.

Subproblem 1

b + 0.1 = 0.331662479 Simplifying b + 0.1 = 0.331662479 Reorder the terms: 0.1 + b = 0.331662479 Solving 0.1 + b = 0.331662479 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + b = 0.331662479 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + b = 0.331662479 + -0.1 b = 0.331662479 + -0.1 Combine like terms: 0.331662479 + -0.1 = 0.231662479 b = 0.231662479 Simplifying b = 0.231662479

Subproblem 2

b + 0.1 = -0.331662479 Simplifying b + 0.1 = -0.331662479 Reorder the terms: 0.1 + b = -0.331662479 Solving 0.1 + b = -0.331662479 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + b = -0.331662479 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + b = -0.331662479 + -0.1 b = -0.331662479 + -0.1 Combine like terms: -0.331662479 + -0.1 = -0.431662479 b = -0.431662479 Simplifying b = -0.431662479

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.231662479, -0.431662479}

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