b^2+5-8b-10=0

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Solution for b^2+5-8b-10=0 equation:


Simplifying
b2 + 5 + -8b + -10 = 0

Reorder the terms:
5 + -10 + -8b + b2 = 0

Combine like terms: 5 + -10 = -5
-5 + -8b + b2 = 0

Solving
-5 + -8b + 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 + -8b + 5 + b2 = 0 + 5

Reorder the terms:
-5 + 5 + -8b + b2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -8b + b2 = 0 + 5
-8b + b2 = 0 + 5

Combine like terms: 0 + 5 = 5
-8b + b2 = 5

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 = 5 + 16

Reorder the terms:
16 + -8b + b2 = 5 + 16

Combine like terms: 5 + 16 = 21
16 + -8b + b2 = 21

Factor a perfect square on the left side:
(b + -4)(b + -4) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(b + -4) equal to 4.582575695 and -4.582575695.

Subproblem 1

b + -4 = 4.582575695 Simplifying b + -4 = 4.582575695 Reorder the terms: -4 + b = 4.582575695 Solving -4 + b = 4.582575695 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 = 4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + b = 4.582575695 + 4 b = 4.582575695 + 4 Combine like terms: 4.582575695 + 4 = 8.582575695 b = 8.582575695 Simplifying b = 8.582575695

Subproblem 2

b + -4 = -4.582575695 Simplifying b + -4 = -4.582575695 Reorder the terms: -4 + b = -4.582575695 Solving -4 + b = -4.582575695 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 = -4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + b = -4.582575695 + 4 b = -4.582575695 + 4 Combine like terms: -4.582575695 + 4 = -0.582575695 b = -0.582575695 Simplifying b = -0.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. b = {8.582575695, -0.582575695}

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