2b^2+13b+10=0

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Solution for 2b^2+13b+10=0 equation:


Simplifying
2b2 + 13b + 10 = 0

Reorder the terms:
10 + 13b + 2b2 = 0

Solving
10 + 13b + 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'.
5 + 6.5b + b2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 6.5b + -5 + b2 = 0 + -5

Reorder the terms:
5 + -5 + 6.5b + b2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 6.5b + b2 = 0 + -5
6.5b + b2 = 0 + -5

Combine like terms: 0 + -5 = -5
6.5b + b2 = -5

The b term is 6.5b.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5b + 10.5625 + b2 = -5 + 10.5625

Reorder the terms:
10.5625 + 6.5b + b2 = -5 + 10.5625

Combine like terms: -5 + 10.5625 = 5.5625
10.5625 + 6.5b + b2 = 5.5625

Factor a perfect square on the left side:
(b + 3.25)(b + 3.25) = 5.5625

Calculate the square root of the right side: 2.358495283

Break this problem into two subproblems by setting 
(b + 3.25) equal to 2.358495283 and -2.358495283.

Subproblem 1

b + 3.25 = 2.358495283 Simplifying b + 3.25 = 2.358495283 Reorder the terms: 3.25 + b = 2.358495283 Solving 3.25 + b = 2.358495283 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + b = 2.358495283 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + b = 2.358495283 + -3.25 b = 2.358495283 + -3.25 Combine like terms: 2.358495283 + -3.25 = -0.891504717 b = -0.891504717 Simplifying b = -0.891504717

Subproblem 2

b + 3.25 = -2.358495283 Simplifying b + 3.25 = -2.358495283 Reorder the terms: 3.25 + b = -2.358495283 Solving 3.25 + b = -2.358495283 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + b = -2.358495283 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + b = -2.358495283 + -3.25 b = -2.358495283 + -3.25 Combine like terms: -2.358495283 + -3.25 = -5.608495283 b = -5.608495283 Simplifying b = -5.608495283

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-0.891504717, -5.608495283}

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