Hii I believe your option would be D. I hope it helps :)
Answer:
x are -5/2 and 0 . Y are 0 and 2.
FOIL method
First:
u squared times u squared equals to u to the fourth.
Outer and Inner:
8u squared + u squared equal 9u squared. Remember, the exponents don't change when adding!
Last:
8 times 1 equals 8
54 buttons ÷ 9 button cards = 6
She should buy 6 cards of buttons.