That feels like it's missing something.
If that's 42a3b2, that factors to 2 x 3 x 7 x a x a x a x b x b
2 x 3 x 7 x a x a = 42a2
3 squared 41
18 does.
2 squared times 3 times 5 squared.
(3^2)(5^2) or 3 squared 5 squared
2 squared 3 squared 5 or 180
2 squared x 3 cubed
3 times 5 squared
The prime factorization of 72 is 2cubed and 3 squared :)
3 times 3 times 5 times 5. Or.... 3 squared times 5 squared.
2 x 32 = 18
It is: 3 squared*5*7 = 315