u^2-22u=9

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Solution for u^2-22u=9 equation:


Simplifying
u2 + -22u = 9

Reorder the terms:
-22u + u2 = 9

Solving
-22u + u2 = 9

Solving for variable 'u'.

Reorder the terms:
-9 + -22u + u2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -22u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -22u + 9 + u2 = 0 + 9

Reorder the terms:
-9 + 9 + -22u + u2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -22u + u2 = 0 + 9
-22u + u2 = 0 + 9

Combine like terms: 0 + 9 = 9
-22u + u2 = 9

The u term is -22u.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22u + 121 + u2 = 9 + 121

Reorder the terms:
121 + -22u + u2 = 9 + 121

Combine like terms: 9 + 121 = 130
121 + -22u + u2 = 130

Factor a perfect square on the left side:
(u + -11)(u + -11) = 130

Calculate the square root of the right side: 11.401754251

Break this problem into two subproblems by setting 
(u + -11) equal to 11.401754251 and -11.401754251.

Subproblem 1

u + -11 = 11.401754251 Simplifying u + -11 = 11.401754251 Reorder the terms: -11 + u = 11.401754251 Solving -11 + u = 11.401754251 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + u = 11.401754251 + 11 Combine like terms: -11 + 11 = 0 0 + u = 11.401754251 + 11 u = 11.401754251 + 11 Combine like terms: 11.401754251 + 11 = 22.401754251 u = 22.401754251 Simplifying u = 22.401754251

Subproblem 2

u + -11 = -11.401754251 Simplifying u + -11 = -11.401754251 Reorder the terms: -11 + u = -11.401754251 Solving -11 + u = -11.401754251 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + u = -11.401754251 + 11 Combine like terms: -11 + 11 = 0 0 + u = -11.401754251 + 11 u = -11.401754251 + 11 Combine like terms: -11.401754251 + 11 = -0.401754251 u = -0.401754251 Simplifying u = -0.401754251

Solution

The solution to the problem is based on the solutions from the subproblems. u = {22.401754251, -0.401754251}

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