2b^2+5b=6

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Solution for 2b^2+5b=6 equation:


Simplifying
2b2 + 5b = 6

Reorder the terms:
5b + 2b2 = 6

Solving
5b + 2b2 = 6

Solving for variable 'b'.

Reorder the terms:
-6 + 5b + 2b2 = 6 + -6

Combine like terms: 6 + -6 = 0
-6 + 5b + 2b2 = 0

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

Divide each side by '2'.
-3 + 2.5b + b2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 2.5b + 3 + b2 = 0 + 3

Reorder the terms:
-3 + 3 + 2.5b + b2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 2.5b + b2 = 0 + 3
2.5b + b2 = 0 + 3

Combine like terms: 0 + 3 = 3
2.5b + b2 = 3

The b term is 2.5b.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5b + 1.5625 + b2 = 3 + 1.5625

Reorder the terms:
1.5625 + 2.5b + b2 = 3 + 1.5625

Combine like terms: 3 + 1.5625 = 4.5625
1.5625 + 2.5b + b2 = 4.5625

Factor a perfect square on the left side:
(b + 1.25)(b + 1.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(b + 1.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

b + 1.25 = 2.136000936 Simplifying b + 1.25 = 2.136000936 Reorder the terms: 1.25 + b = 2.136000936 Solving 1.25 + b = 2.136000936 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + b = 2.136000936 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + b = 2.136000936 + -1.25 b = 2.136000936 + -1.25 Combine like terms: 2.136000936 + -1.25 = 0.886000936 b = 0.886000936 Simplifying b = 0.886000936

Subproblem 2

b + 1.25 = -2.136000936 Simplifying b + 1.25 = -2.136000936 Reorder the terms: 1.25 + b = -2.136000936 Solving 1.25 + b = -2.136000936 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + b = -2.136000936 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + b = -2.136000936 + -1.25 b = -2.136000936 + -1.25 Combine like terms: -2.136000936 + -1.25 = -3.386000936 b = -3.386000936 Simplifying b = -3.386000936

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.886000936, -3.386000936}

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