227k views
3 votes
Which expression is a perfect cube? A.x^8 B.y^24 C.m^28 D.s^64

2 Answers

4 votes
The answer is A

Try breaking down each solution into cubic form.

A) a^8 = ((a^2)^3) (perfect cube because 2 is a prime number)

B) a^24 = (((a^2)^3)^2) (not a cube because of the 2)

C) a^28 = ((a^2)^2)^7 (not a cube because of 7)

B) a^64 = (((a^2)^32) (not a cube since 32 is not a factor of 3)

Hope I helped :)
User Davina
by
8.5k points
4 votes
B is your answer because when you take 24/3=8 but when you take 8/3 or 28/3 or 64/3 you will get a decimal.
User Tamira
by
6.7k points