b^2-10b-5=0

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


Simplifying
b2 + -10b + -5 = 0

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

Solving
-5 + -10b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -10b + 5 + b2 = 0 + 5

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

Combine like terms: -5 + 5 = 0
0 + -10b + b2 = 0 + 5
-10b + b2 = 0 + 5

Combine like terms: 0 + 5 = 5
-10b + b2 = 5

The b term is -10b.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10b + 25 + b2 = 5 + 25

Reorder the terms:
25 + -10b + b2 = 5 + 25

Combine like terms: 5 + 25 = 30
25 + -10b + b2 = 30

Factor a perfect square on the left side:
(b + -5)(b + -5) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(b + -5) equal to 5.477225575 and -5.477225575.

Subproblem 1

b + -5 = 5.477225575 Simplifying b + -5 = 5.477225575 Reorder the terms: -5 + b = 5.477225575 Solving -5 + b = 5.477225575 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + b = 5.477225575 + 5 Combine like terms: -5 + 5 = 0 0 + b = 5.477225575 + 5 b = 5.477225575 + 5 Combine like terms: 5.477225575 + 5 = 10.477225575 b = 10.477225575 Simplifying b = 10.477225575

Subproblem 2

b + -5 = -5.477225575 Simplifying b + -5 = -5.477225575 Reorder the terms: -5 + b = -5.477225575 Solving -5 + b = -5.477225575 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + b = -5.477225575 + 5 Combine like terms: -5 + 5 = 0 0 + b = -5.477225575 + 5 b = -5.477225575 + 5 Combine like terms: -5.477225575 + 5 = -0.477225575 b = -0.477225575 Simplifying b = -0.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. b = {10.477225575, -0.477225575}

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