Question

please question no 13

Answer 1

Concepts used :

1) Deriving conclusions from given equation or things.

2) Identity :
${x}^{3} - {y}^{ 3} = (x - y)( {x}^{2} + {y}^{2} + xy)$
3) Using known identities.

4) Forming equations

5) Substituting values to a variable.

6) Anything × 0 = 0