b^2-8b-58=0

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Solution for b^2-8b-58=0 equation:


Simplifying
b2 + -8b + -58 = 0

Reorder the terms:
-58 + -8b + b2 = 0

Solving
-58 + -8b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '58' to each side of the equation.
-58 + -8b + 58 + b2 = 0 + 58

Reorder the terms:
-58 + 58 + -8b + b2 = 0 + 58

Combine like terms: -58 + 58 = 0
0 + -8b + b2 = 0 + 58
-8b + b2 = 0 + 58

Combine like terms: 0 + 58 = 58
-8b + b2 = 58

The b term is -8b.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8b + 16 + b2 = 58 + 16

Reorder the terms:
16 + -8b + b2 = 58 + 16

Combine like terms: 58 + 16 = 74
16 + -8b + b2 = 74

Factor a perfect square on the left side:
(b + -4)(b + -4) = 74

Calculate the square root of the right side: 8.602325267

Break this problem into two subproblems by setting 
(b + -4) equal to 8.602325267 and -8.602325267.

Subproblem 1

b + -4 = 8.602325267 Simplifying b + -4 = 8.602325267 Reorder the terms: -4 + b = 8.602325267 Solving -4 + b = 8.602325267 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = 8.602325267 + 4 Combine like terms: -4 + 4 = 0 0 + b = 8.602325267 + 4 b = 8.602325267 + 4 Combine like terms: 8.602325267 + 4 = 12.602325267 b = 12.602325267 Simplifying b = 12.602325267

Subproblem 2

b + -4 = -8.602325267 Simplifying b + -4 = -8.602325267 Reorder the terms: -4 + b = -8.602325267 Solving -4 + b = -8.602325267 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = -8.602325267 + 4 Combine like terms: -4 + 4 = 0 0 + b = -8.602325267 + 4 b = -8.602325267 + 4 Combine like terms: -8.602325267 + 4 = -4.602325267 b = -4.602325267 Simplifying b = -4.602325267

Solution

The solution to the problem is based on the solutions from the subproblems. b = {12.602325267, -4.602325267}

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