5b^2-42b+59=0

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Solution for 5b^2-42b+59=0 equation:


Simplifying
5b2 + -42b + 59 = 0

Reorder the terms:
59 + -42b + 5b2 = 0

Solving
59 + -42b + 5b2 = 0

Solving for variable 'b'.

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

Divide each side by '5'.
11.8 + -8.4b + b2 = 0

Move the constant term to the right:

Add '-11.8' to each side of the equation.
11.8 + -8.4b + -11.8 + b2 = 0 + -11.8

Reorder the terms:
11.8 + -11.8 + -8.4b + b2 = 0 + -11.8

Combine like terms: 11.8 + -11.8 = 0.0
0.0 + -8.4b + b2 = 0 + -11.8
-8.4b + b2 = 0 + -11.8

Combine like terms: 0 + -11.8 = -11.8
-8.4b + b2 = -11.8

The b term is -8.4b.  Take half its coefficient (-4.2).
Square it (17.64) and add it to both sides.

Add '17.64' to each side of the equation.
-8.4b + 17.64 + b2 = -11.8 + 17.64

Reorder the terms:
17.64 + -8.4b + b2 = -11.8 + 17.64

Combine like terms: -11.8 + 17.64 = 5.84
17.64 + -8.4b + b2 = 5.84

Factor a perfect square on the left side:
(b + -4.2)(b + -4.2) = 5.84

Calculate the square root of the right side: 2.416609195

Break this problem into two subproblems by setting 
(b + -4.2) equal to 2.416609195 and -2.416609195.

Subproblem 1

b + -4.2 = 2.416609195 Simplifying b + -4.2 = 2.416609195 Reorder the terms: -4.2 + b = 2.416609195 Solving -4.2 + b = 2.416609195 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4.2' to each side of the equation. -4.2 + 4.2 + b = 2.416609195 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + b = 2.416609195 + 4.2 b = 2.416609195 + 4.2 Combine like terms: 2.416609195 + 4.2 = 6.616609195 b = 6.616609195 Simplifying b = 6.616609195

Subproblem 2

b + -4.2 = -2.416609195 Simplifying b + -4.2 = -2.416609195 Reorder the terms: -4.2 + b = -2.416609195 Solving -4.2 + b = -2.416609195 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4.2' to each side of the equation. -4.2 + 4.2 + b = -2.416609195 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + b = -2.416609195 + 4.2 b = -2.416609195 + 4.2 Combine like terms: -2.416609195 + 4.2 = 1.783390805 b = 1.783390805 Simplifying b = 1.783390805

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.616609195, 1.783390805}

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