I have a doubt with the following question: - What is the value of x^3 - y^3 ?
(1) x^6 - y^6 = 0
(2) y = 0
I discard A, B and D because there's not enough information. I know the answer is C, but I don't get a clue of why.
Could someone help me with that?
So you need x^3 - y^3
.Statement 1:x^6 - y^6 = (x^3 - y^3)(x^3+y^3) = 0
Insufficient, since either one of the two terms could be zero. Statement 2:y^3 = 0
, which means x^3 - y^3 = x^3.
Combining both, and substituting y = 0 in the second statement, we get : x^6 = 0
, which means x = 0
, and hence x^3 - y^3 = 0
Hence the answer is C.