b^2-5b-10=0

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


Simplifying
b2 + -5b + -10 = 0

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

Solving
-10 + -5b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The b term is -5b.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5b + 6.25 + b2 = 10 + 6.25

Reorder the terms:
6.25 + -5b + b2 = 10 + 6.25

Combine like terms: 10 + 6.25 = 16.25
6.25 + -5b + b2 = 16.25

Factor a perfect square on the left side:
(b + -2.5)(b + -2.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(b + -2.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

b + -2.5 = 4.031128874 Simplifying b + -2.5 = 4.031128874 Reorder the terms: -2.5 + b = 4.031128874 Solving -2.5 + b = 4.031128874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + b = 4.031128874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + b = 4.031128874 + 2.5 b = 4.031128874 + 2.5 Combine like terms: 4.031128874 + 2.5 = 6.531128874 b = 6.531128874 Simplifying b = 6.531128874

Subproblem 2

b + -2.5 = -4.031128874 Simplifying b + -2.5 = -4.031128874 Reorder the terms: -2.5 + b = -4.031128874 Solving -2.5 + b = -4.031128874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + b = -4.031128874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + b = -4.031128874 + 2.5 b = -4.031128874 + 2.5 Combine like terms: -4.031128874 + 2.5 = -1.531128874 b = -1.531128874 Simplifying b = -1.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.531128874, -1.531128874}

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