2b^2+3b=1

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Solution for 2b^2+3b=1 equation:


Simplifying
2b2 + 3b = 1

Reorder the terms:
3b + 2b2 = 1

Solving
3b + 2b2 = 1

Solving for variable 'b'.

Reorder the terms:
-1 + 3b + 2b2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 3b + 2b2 = 0

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

Divide each side by '2'.
-0.5 + 1.5b + b2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 1.5b + 0.5 + b2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 1.5b + b2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 1.5b + b2 = 0 + 0.5
1.5b + b2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
1.5b + b2 = 0.5

The b term is 1.5b.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5b + 0.5625 + b2 = 0.5 + 0.5625

Reorder the terms:
0.5625 + 1.5b + b2 = 0.5 + 0.5625

Combine like terms: 0.5 + 0.5625 = 1.0625
0.5625 + 1.5b + b2 = 1.0625

Factor a perfect square on the left side:
(b + 0.75)(b + 0.75) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(b + 0.75) equal to 1.030776406 and -1.030776406.

Subproblem 1

b + 0.75 = 1.030776406 Simplifying b + 0.75 = 1.030776406 Reorder the terms: 0.75 + b = 1.030776406 Solving 0.75 + b = 1.030776406 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + b = 1.030776406 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + b = 1.030776406 + -0.75 b = 1.030776406 + -0.75 Combine like terms: 1.030776406 + -0.75 = 0.280776406 b = 0.280776406 Simplifying b = 0.280776406

Subproblem 2

b + 0.75 = -1.030776406 Simplifying b + 0.75 = -1.030776406 Reorder the terms: 0.75 + b = -1.030776406 Solving 0.75 + b = -1.030776406 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + b = -1.030776406 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + b = -1.030776406 + -0.75 b = -1.030776406 + -0.75 Combine like terms: -1.030776406 + -0.75 = -1.780776406 b = -1.780776406 Simplifying b = -1.780776406

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.280776406, -1.780776406}

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