Step-by-step explanation:
1) keep the number having x^2 in one group.
keep the number having xy^2 in another group.
2) a. 7x^2. 5x^2
like this add/subtract every number.
3)2xy+3xy+4zz=5xy+4zz
like this add every number.
if you have any query please feel free to ask.
