b^2-9b+4=0

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Solution for b^2-9b+4=0 equation:


Simplifying
b2 + -9b + 4 = 0

Reorder the terms:
4 + -9b + b2 = 0

Solving
4 + -9b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -9b + -4 + b2 = 0 + -4

Reorder the terms:
4 + -4 + -9b + b2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -9b + b2 = 0 + -4
-9b + b2 = 0 + -4

Combine like terms: 0 + -4 = -4
-9b + b2 = -4

The b term is -9b.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9b + 20.25 + b2 = -4 + 20.25

Reorder the terms:
20.25 + -9b + b2 = -4 + 20.25

Combine like terms: -4 + 20.25 = 16.25
20.25 + -9b + b2 = 16.25

Factor a perfect square on the left side:
(b + -4.5)(b + -4.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(b + -4.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

b + -4.5 = 4.031128874 Simplifying b + -4.5 = 4.031128874 Reorder the terms: -4.5 + b = 4.031128874 Solving -4.5 + b = 4.031128874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + b = 4.031128874 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + b = 4.031128874 + 4.5 b = 4.031128874 + 4.5 Combine like terms: 4.031128874 + 4.5 = 8.531128874 b = 8.531128874 Simplifying b = 8.531128874

Subproblem 2

b + -4.5 = -4.031128874 Simplifying b + -4.5 = -4.031128874 Reorder the terms: -4.5 + b = -4.031128874 Solving -4.5 + b = -4.031128874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + b = -4.031128874 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + b = -4.031128874 + 4.5 b = -4.031128874 + 4.5 Combine like terms: -4.031128874 + 4.5 = 0.468871126 b = 0.468871126 Simplifying b = 0.468871126

Solution

The solution to the problem is based on the solutions from the subproblems. b = {8.531128874, 0.468871126}

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