Question

Solve question no. 18 and 19

Answer 1

Answer:

It is the case of special Indenties

for 18 use formula given below

a³+b³=(a+b) (a²-ab+b²)

a³-b³= (a+b) (a²+ab +b²)

and for 19 use for given below

a³+b³/(a²-b²+ab) = ( a+b)

by a student of

Akaash Instititute