5b^2-10b-168=0

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Solution for 5b^2-10b-168=0 equation:


Simplifying
5b2 + -10b + -168 = 0

Reorder the terms:
-168 + -10b + 5b2 = 0

Solving
-168 + -10b + 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'.
-33.6 + -2b + b2 = 0

Move the constant term to the right:

Add '33.6' to each side of the equation.
-33.6 + -2b + 33.6 + b2 = 0 + 33.6

Reorder the terms:
-33.6 + 33.6 + -2b + b2 = 0 + 33.6

Combine like terms: -33.6 + 33.6 = 0.0
0.0 + -2b + b2 = 0 + 33.6
-2b + b2 = 0 + 33.6

Combine like terms: 0 + 33.6 = 33.6
-2b + b2 = 33.6

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 = 33.6 + 1

Reorder the terms:
1 + -2b + b2 = 33.6 + 1

Combine like terms: 33.6 + 1 = 34.6
1 + -2b + b2 = 34.6

Factor a perfect square on the left side:
(b + -1)(b + -1) = 34.6

Calculate the square root of the right side: 5.882176468

Break this problem into two subproblems by setting 
(b + -1) equal to 5.882176468 and -5.882176468.

Subproblem 1

b + -1 = 5.882176468 Simplifying b + -1 = 5.882176468 Reorder the terms: -1 + b = 5.882176468 Solving -1 + b = 5.882176468 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 = 5.882176468 + 1 Combine like terms: -1 + 1 = 0 0 + b = 5.882176468 + 1 b = 5.882176468 + 1 Combine like terms: 5.882176468 + 1 = 6.882176468 b = 6.882176468 Simplifying b = 6.882176468

Subproblem 2

b + -1 = -5.882176468 Simplifying b + -1 = -5.882176468 Reorder the terms: -1 + b = -5.882176468 Solving -1 + b = -5.882176468 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 = -5.882176468 + 1 Combine like terms: -1 + 1 = 0 0 + b = -5.882176468 + 1 b = -5.882176468 + 1 Combine like terms: -5.882176468 + 1 = -4.882176468 b = -4.882176468 Simplifying b = -4.882176468

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.882176468, -4.882176468}

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