2b^2+5b=2

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


Simplifying
2b2 + 5b = 2

Reorder the terms:
5b + 2b2 = 2

Solving
5b + 2b2 = 2

Solving for variable 'b'.

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

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

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

Divide each side by '2'.
-1 + 2.5b + b2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 2.5b + 1 + b2 = 0 + 1

Reorder the terms:
-1 + 1 + 2.5b + b2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 2.5b + b2 = 0 + 1
2.5b + b2 = 0 + 1

Combine like terms: 0 + 1 = 1
2.5b + b2 = 1

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 = 1 + 1.5625

Reorder the terms:
1.5625 + 2.5b + b2 = 1 + 1.5625

Combine like terms: 1 + 1.5625 = 2.5625
1.5625 + 2.5b + b2 = 2.5625

Factor a perfect square on the left side:
(b + 1.25)(b + 1.25) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(b + 1.25) equal to 1.600781059 and -1.600781059.

Subproblem 1

b + 1.25 = 1.600781059 Simplifying b + 1.25 = 1.600781059 Reorder the terms: 1.25 + b = 1.600781059 Solving 1.25 + b = 1.600781059 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 = 1.600781059 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + b = 1.600781059 + -1.25 b = 1.600781059 + -1.25 Combine like terms: 1.600781059 + -1.25 = 0.350781059 b = 0.350781059 Simplifying b = 0.350781059

Subproblem 2

b + 1.25 = -1.600781059 Simplifying b + 1.25 = -1.600781059 Reorder the terms: 1.25 + b = -1.600781059 Solving 1.25 + b = -1.600781059 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 = -1.600781059 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + b = -1.600781059 + -1.25 b = -1.600781059 + -1.25 Combine like terms: -1.600781059 + -1.25 = -2.850781059 b = -2.850781059 Simplifying b = -2.850781059

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.350781059, -2.850781059}

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