Question

What number must you add to the polynomial below to complete the square.
x^2-22x

Answer 1

If I remember correctly, you complete the square by taking one half of b (b is the coefficient of the x term) and squaring it. So in this case you would have:
\[(22/2)^{2}=11^2\]

Answer 2

121?

Answer 3

Yes. Then you could make the equation (x-11)^2. Foil this out to make sure it works.