Question

Which expression is a perfect cube?

a.) 12x^12 y^18
b.)12x^27 y^125
c.)64x^15 y^18
d.)64x^27 y^125

Answer 1

I do believe the answer is C.

Answer 2

perfect cube

rembmber (x^m)^n=x^(mn)
so cued would be (x^m)^3=x^(3m)
the exponents must be divisble by 3
well, all the exponents are divisble by 3 except the ones that are 125


check A and C now
see the coefients
12 is not a perfecte cube, A is wrong


answer is C
it can be written in form
(4x⁵)³+(y⁶)³