u^2-9=2u^2-11u+3

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Solution for u^2-9=2u^2-11u+3 equation:


Simplifying
u2 + -9 = 2u2 + -11u + 3

Reorder the terms:
-9 + u2 = 2u2 + -11u + 3

Reorder the terms:
-9 + u2 = 3 + -11u + 2u2

Solving
-9 + u2 = 3 + -11u + 2u2

Solving for variable 'u'.

Reorder the terms:
-9 + -3 + 11u + u2 + -2u2 = 3 + -11u + 2u2 + -3 + 11u + -2u2

Combine like terms: -9 + -3 = -12
-12 + 11u + u2 + -2u2 = 3 + -11u + 2u2 + -3 + 11u + -2u2

Combine like terms: u2 + -2u2 = -1u2
-12 + 11u + -1u2 = 3 + -11u + 2u2 + -3 + 11u + -2u2

Reorder the terms:
-12 + 11u + -1u2 = 3 + -3 + -11u + 11u + 2u2 + -2u2

Combine like terms: 3 + -3 = 0
-12 + 11u + -1u2 = 0 + -11u + 11u + 2u2 + -2u2
-12 + 11u + -1u2 = -11u + 11u + 2u2 + -2u2

Combine like terms: -11u + 11u = 0
-12 + 11u + -1u2 = 0 + 2u2 + -2u2
-12 + 11u + -1u2 = 2u2 + -2u2

Combine like terms: 2u2 + -2u2 = 0
-12 + 11u + -1u2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
12 + -11u + u2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -11u + -12 + u2 = 0 + -12

Reorder the terms:
12 + -12 + -11u + u2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -11u + u2 = 0 + -12
-11u + u2 = 0 + -12

Combine like terms: 0 + -12 = -12
-11u + u2 = -12

The u term is -11u.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11u + 30.25 + u2 = -12 + 30.25

Reorder the terms:
30.25 + -11u + u2 = -12 + 30.25

Combine like terms: -12 + 30.25 = 18.25
30.25 + -11u + u2 = 18.25

Factor a perfect square on the left side:
(u + -5.5)(u + -5.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(u + -5.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

u + -5.5 = 4.272001873 Simplifying u + -5.5 = 4.272001873 Reorder the terms: -5.5 + u = 4.272001873 Solving -5.5 + u = 4.272001873 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + u = 4.272001873 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + u = 4.272001873 + 5.5 u = 4.272001873 + 5.5 Combine like terms: 4.272001873 + 5.5 = 9.772001873 u = 9.772001873 Simplifying u = 9.772001873

Subproblem 2

u + -5.5 = -4.272001873 Simplifying u + -5.5 = -4.272001873 Reorder the terms: -5.5 + u = -4.272001873 Solving -5.5 + u = -4.272001873 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + u = -4.272001873 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + u = -4.272001873 + 5.5 u = -4.272001873 + 5.5 Combine like terms: -4.272001873 + 5.5 = 1.227998127 u = 1.227998127 Simplifying u = 1.227998127

Solution

The solution to the problem is based on the solutions from the subproblems. u = {9.772001873, 1.227998127}

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