What number would need to be added to this expressions to make it a perfect square trinomial?

x^2-2x

2
1
- 1
- 2

50 people men and women were asked if they watched at least one sport on tv. 20 of the people surveyed are women, but only 9 of them watch at least one sport on tv. 16 of the men watch at least one sport on tv. make a a two-way table and a relative frequency table to represent the data.