10b^2-41b+5=0

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Solution for 10b^2-41b+5=0 equation:


Simplifying
10b2 + -41b + 5 = 0

Reorder the terms:
5 + -41b + 10b2 = 0

Solving
5 + -41b + 10b2 = 0

Solving for variable 'b'.

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

Divide each side by '10'.
0.5 + -4.1b + b2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -4.1b + -0.5 + b2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -4.1b + b2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -4.1b + b2 = 0 + -0.5
-4.1b + b2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-4.1b + b2 = -0.5

The b term is -4.1b.  Take half its coefficient (-2.05).
Square it (4.2025) and add it to both sides.

Add '4.2025' to each side of the equation.
-4.1b + 4.2025 + b2 = -0.5 + 4.2025

Reorder the terms:
4.2025 + -4.1b + b2 = -0.5 + 4.2025

Combine like terms: -0.5 + 4.2025 = 3.7025
4.2025 + -4.1b + b2 = 3.7025

Factor a perfect square on the left side:
(b + -2.05)(b + -2.05) = 3.7025

Calculate the square root of the right side: 1.92418814

Break this problem into two subproblems by setting 
(b + -2.05) equal to 1.92418814 and -1.92418814.

Subproblem 1

b + -2.05 = 1.92418814 Simplifying b + -2.05 = 1.92418814 Reorder the terms: -2.05 + b = 1.92418814 Solving -2.05 + b = 1.92418814 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.05' to each side of the equation. -2.05 + 2.05 + b = 1.92418814 + 2.05 Combine like terms: -2.05 + 2.05 = 0.00 0.00 + b = 1.92418814 + 2.05 b = 1.92418814 + 2.05 Combine like terms: 1.92418814 + 2.05 = 3.97418814 b = 3.97418814 Simplifying b = 3.97418814

Subproblem 2

b + -2.05 = -1.92418814 Simplifying b + -2.05 = -1.92418814 Reorder the terms: -2.05 + b = -1.92418814 Solving -2.05 + b = -1.92418814 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.05' to each side of the equation. -2.05 + 2.05 + b = -1.92418814 + 2.05 Combine like terms: -2.05 + 2.05 = 0.00 0.00 + b = -1.92418814 + 2.05 b = -1.92418814 + 2.05 Combine like terms: -1.92418814 + 2.05 = 0.12581186 b = 0.12581186 Simplifying b = 0.12581186

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.97418814, 0.12581186}

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