Question

pls answer this question expansion lesson ​

Answer 1

Answer:

sorry I don't know answer

Answer 2

Answer:

As you know that if a+b+c=0

then, a^3+b^3+c^3=3abc

Now, coming to your question

x+2y+3z=0

so, x³+(2y) ³+(3z) ³=3×x×2y×3z

=18xyz

so, you can prove it in this way.