If a is a positive integer, and if the units digit of a^2 is 9 and the units digit of (a+1)^2 is 4, what is the units X digit of (a+2)^2?  Options.
A) 1
B) 3
C) 5
D) 6
E) C. 14
I also got A. By punching in numers:   X...7^2=...9   ...8^2=...4   ...9^2=...1.1
<result>A</result>
If a is a positive integer, and if the units digit of a^2 is 9 and the units digit of (a+1)^2 is 4, what is the units X digit of (a+2)^2?