b^2-6b=8

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Solution for b^2-6b=8 equation:


Simplifying
b2 + -6b = 8

Reorder the terms:
-6b + b2 = 8

Solving
-6b + b2 = 8

Solving for variable 'b'.

Reorder the terms:
-8 + -6b + b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + -6b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6b + 8 + b2 = 0 + 8

Reorder the terms:
-8 + 8 + -6b + b2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -6b + b2 = 0 + 8
-6b + b2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6b + b2 = 8

The b term is -6b.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6b + 9 + b2 = 8 + 9

Reorder the terms:
9 + -6b + b2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6b + b2 = 17

Factor a perfect square on the left side:
(b + -3)(b + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(b + -3) equal to 4.123105626 and -4.123105626.

Subproblem 1

b + -3 = 4.123105626 Simplifying b + -3 = 4.123105626 Reorder the terms: -3 + b = 4.123105626 Solving -3 + b = 4.123105626 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + b = 4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + b = 4.123105626 + 3 b = 4.123105626 + 3 Combine like terms: 4.123105626 + 3 = 7.123105626 b = 7.123105626 Simplifying b = 7.123105626

Subproblem 2

b + -3 = -4.123105626 Simplifying b + -3 = -4.123105626 Reorder the terms: -3 + b = -4.123105626 Solving -3 + b = -4.123105626 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + b = -4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + b = -4.123105626 + 3 b = -4.123105626 + 3 Combine like terms: -4.123105626 + 3 = -1.123105626 b = -1.123105626 Simplifying b = -1.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. b = {7.123105626, -1.123105626}

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