8b^2-16b-73=0

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Solution for 8b^2-16b-73=0 equation:


Simplifying
8b2 + -16b + -73 = 0

Reorder the terms:
-73 + -16b + 8b2 = 0

Solving
-73 + -16b + 8b2 = 0

Solving for variable 'b'.

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-9.125 + -2b + b2 = 0

Move the constant term to the right:

Add '9.125' to each side of the equation.
-9.125 + -2b + 9.125 + b2 = 0 + 9.125

Reorder the terms:
-9.125 + 9.125 + -2b + b2 = 0 + 9.125

Combine like terms: -9.125 + 9.125 = 0.000
0.000 + -2b + b2 = 0 + 9.125
-2b + b2 = 0 + 9.125

Combine like terms: 0 + 9.125 = 9.125
-2b + b2 = 9.125

The b term is -2b.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2b + 1 + b2 = 9.125 + 1

Reorder the terms:
1 + -2b + b2 = 9.125 + 1

Combine like terms: 9.125 + 1 = 10.125
1 + -2b + b2 = 10.125

Factor a perfect square on the left side:
(b + -1)(b + -1) = 10.125

Calculate the square root of the right side: 3.181980515

Break this problem into two subproblems by setting 
(b + -1) equal to 3.181980515 and -3.181980515.

Subproblem 1

b + -1 = 3.181980515 Simplifying b + -1 = 3.181980515 Reorder the terms: -1 + b = 3.181980515 Solving -1 + b = 3.181980515 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = 3.181980515 + 1 Combine like terms: -1 + 1 = 0 0 + b = 3.181980515 + 1 b = 3.181980515 + 1 Combine like terms: 3.181980515 + 1 = 4.181980515 b = 4.181980515 Simplifying b = 4.181980515

Subproblem 2

b + -1 = -3.181980515 Simplifying b + -1 = -3.181980515 Reorder the terms: -1 + b = -3.181980515 Solving -1 + b = -3.181980515 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = -3.181980515 + 1 Combine like terms: -1 + 1 = 0 0 + b = -3.181980515 + 1 b = -3.181980515 + 1 Combine like terms: -3.181980515 + 1 = -2.181980515 b = -2.181980515 Simplifying b = -2.181980515

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4.181980515, -2.181980515}

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