Question 1084445
8x2 - 4xy + 7x2y2
===================
Hint:
8 is not a variable.  It doesn't vary.  It's always 8.
2 is not a variable.
4 is not a variable.
7 is not a variable.
=============
PS  Use ^ (Shift 6) for exponents.
===============
8x^2 - 4xy + 7x^2^y2