The unit digit of is 1.
The unit digit of is 2.
The unit digit of is 6.
The unit digit of is 4.
The unit digit of is 0.
Now, we have:
For the unit digit of is 3 and it can't be a perfect square.
I've been racking my brain out for the last two days on this problem, but I don't even have the slightest clue on how to approach this problem. Could anybody point me in the right direction please?
Q: Find the values of for which is a perfect square. (Hint: Determine the possibilities for the units digit of a perfect square.)
Using the hint:
This leads to a pattern: 0 1 4 9 6 5 6 9 4 1 0
Then I'm just lost....