5b^2-20b-64=0

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Solution for 5b^2-20b-64=0 equation:


Simplifying
5b2 + -20b + -64 = 0

Reorder the terms:
-64 + -20b + 5b2 = 0

Solving
-64 + -20b + 5b2 = 0

Solving for variable 'b'.

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

Divide each side by '5'.
-12.8 + -4b + b2 = 0

Move the constant term to the right:

Add '12.8' to each side of the equation.
-12.8 + -4b + 12.8 + b2 = 0 + 12.8

Reorder the terms:
-12.8 + 12.8 + -4b + b2 = 0 + 12.8

Combine like terms: -12.8 + 12.8 = 0.0
0.0 + -4b + b2 = 0 + 12.8
-4b + b2 = 0 + 12.8

Combine like terms: 0 + 12.8 = 12.8
-4b + b2 = 12.8

The b term is -4b.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4b + 4 + b2 = 12.8 + 4

Reorder the terms:
4 + -4b + b2 = 12.8 + 4

Combine like terms: 12.8 + 4 = 16.8
4 + -4b + b2 = 16.8

Factor a perfect square on the left side:
(b + -2)(b + -2) = 16.8

Calculate the square root of the right side: 4.098780306

Break this problem into two subproblems by setting 
(b + -2) equal to 4.098780306 and -4.098780306.

Subproblem 1

b + -2 = 4.098780306 Simplifying b + -2 = 4.098780306 Reorder the terms: -2 + b = 4.098780306 Solving -2 + b = 4.098780306 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = 4.098780306 + 2 Combine like terms: -2 + 2 = 0 0 + b = 4.098780306 + 2 b = 4.098780306 + 2 Combine like terms: 4.098780306 + 2 = 6.098780306 b = 6.098780306 Simplifying b = 6.098780306

Subproblem 2

b + -2 = -4.098780306 Simplifying b + -2 = -4.098780306 Reorder the terms: -2 + b = -4.098780306 Solving -2 + b = -4.098780306 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = -4.098780306 + 2 Combine like terms: -2 + 2 = 0 0 + b = -4.098780306 + 2 b = -4.098780306 + 2 Combine like terms: -4.098780306 + 2 = -2.098780306 b = -2.098780306 Simplifying b = -2.098780306

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.098780306, -2.098780306}

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