u^2-9u+5=0

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


Simplifying
u2 + -9u + 5 = 0

Reorder the terms:
5 + -9u + u2 = 0

Solving
5 + -9u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -9u + -5 + u2 = 0 + -5

Reorder the terms:
5 + -5 + -9u + u2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -9u + u2 = 0 + -5
-9u + u2 = 0 + -5

Combine like terms: 0 + -5 = -5
-9u + u2 = -5

The u term is -9u.  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.
-9u + 20.25 + u2 = -5 + 20.25

Reorder the terms:
20.25 + -9u + u2 = -5 + 20.25

Combine like terms: -5 + 20.25 = 15.25
20.25 + -9u + u2 = 15.25

Factor a perfect square on the left side:
(u + -4.5)(u + -4.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(u + -4.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

u + -4.5 = 3.905124838 Simplifying u + -4.5 = 3.905124838 Reorder the terms: -4.5 + u = 3.905124838 Solving -4.5 + u = 3.905124838 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + u = 3.905124838 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + u = 3.905124838 + 4.5 u = 3.905124838 + 4.5 Combine like terms: 3.905124838 + 4.5 = 8.405124838 u = 8.405124838 Simplifying u = 8.405124838

Subproblem 2

u + -4.5 = -3.905124838 Simplifying u + -4.5 = -3.905124838 Reorder the terms: -4.5 + u = -3.905124838 Solving -4.5 + u = -3.905124838 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + u = -3.905124838 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + u = -3.905124838 + 4.5 u = -3.905124838 + 4.5 Combine like terms: -3.905124838 + 4.5 = 0.594875162 u = 0.594875162 Simplifying u = 0.594875162

Solution

The solution to the problem is based on the solutions from the subproblems. u = {8.405124838, 0.594875162}

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