The difference of a number k and 8 is greater than 24

look at the picture i have filled out a table for it. hope this .

1. a^4+8a^3+24a^2+32a+16

2.y^8+8y^7+28y^6+56y^5+70y^4+56y^3+28y^2+8y+1

3.x^6-3x^4y^2+3x^2y^4-y^6

the answer is a.

606.0 sq. in.

i got it down.