How do i determine whether each binomial is a difference of two squares

What is the range? can’t seem to find it out

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%