2b^2+11b+8=0

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Solution for 2b^2+11b+8=0 equation:


Simplifying
2b2 + 11b + 8 = 0

Reorder the terms:
8 + 11b + 2b2 = 0

Solving
8 + 11b + 2b2 = 0

Solving for variable 'b'.

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

Divide each side by '2'.
4 + 5.5b + b2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 5.5b + -4 + b2 = 0 + -4

Reorder the terms:
4 + -4 + 5.5b + b2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 5.5b + b2 = 0 + -4
5.5b + b2 = 0 + -4

Combine like terms: 0 + -4 = -4
5.5b + b2 = -4

The b term is 5.5b.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5b + 7.5625 + b2 = -4 + 7.5625

Reorder the terms:
7.5625 + 5.5b + b2 = -4 + 7.5625

Combine like terms: -4 + 7.5625 = 3.5625
7.5625 + 5.5b + b2 = 3.5625

Factor a perfect square on the left side:
(b + 2.75)(b + 2.75) = 3.5625

Calculate the square root of the right side: 1.887458609

Break this problem into two subproblems by setting 
(b + 2.75) equal to 1.887458609 and -1.887458609.

Subproblem 1

b + 2.75 = 1.887458609 Simplifying b + 2.75 = 1.887458609 Reorder the terms: 2.75 + b = 1.887458609 Solving 2.75 + b = 1.887458609 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + b = 1.887458609 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + b = 1.887458609 + -2.75 b = 1.887458609 + -2.75 Combine like terms: 1.887458609 + -2.75 = -0.862541391 b = -0.862541391 Simplifying b = -0.862541391

Subproblem 2

b + 2.75 = -1.887458609 Simplifying b + 2.75 = -1.887458609 Reorder the terms: 2.75 + b = -1.887458609 Solving 2.75 + b = -1.887458609 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + b = -1.887458609 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + b = -1.887458609 + -2.75 b = -1.887458609 + -2.75 Combine like terms: -1.887458609 + -2.75 = -4.637458609 b = -4.637458609 Simplifying b = -4.637458609

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-0.862541391, -4.637458609}

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