2b^2-9b+5=0

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Solution for 2b^2-9b+5=0 equation:


Simplifying
2b2 + -9b + 5 = 0

Reorder the terms:
5 + -9b + 2b2 = 0

Solving
5 + -9b + 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'.
2.5 + -4.5b + b2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -4.5b + -2.5 + b2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -4.5b + b2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -4.5b + b2 = 0 + -2.5
-4.5b + b2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-4.5b + b2 = -2.5

The b term is -4.5b.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5b + 5.0625 + b2 = -2.5 + 5.0625

Reorder the terms:
5.0625 + -4.5b + b2 = -2.5 + 5.0625

Combine like terms: -2.5 + 5.0625 = 2.5625
5.0625 + -4.5b + b2 = 2.5625

Factor a perfect square on the left side:
(b + -2.25)(b + -2.25) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(b + -2.25) equal to 1.600781059 and -1.600781059.

Subproblem 1

b + -2.25 = 1.600781059 Simplifying b + -2.25 = 1.600781059 Reorder the terms: -2.25 + b = 1.600781059 Solving -2.25 + b = 1.600781059 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + b = 1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + b = 1.600781059 + 2.25 b = 1.600781059 + 2.25 Combine like terms: 1.600781059 + 2.25 = 3.850781059 b = 3.850781059 Simplifying b = 3.850781059

Subproblem 2

b + -2.25 = -1.600781059 Simplifying b + -2.25 = -1.600781059 Reorder the terms: -2.25 + b = -1.600781059 Solving -2.25 + b = -1.600781059 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + b = -1.600781059 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + b = -1.600781059 + 2.25 b = -1.600781059 + 2.25 Combine like terms: -1.600781059 + 2.25 = 0.649218941 b = 0.649218941 Simplifying b = 0.649218941

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.850781059, 0.649218941}

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