Question

Evaluate (21)3 using and appropriate identity?​

Answer 1

Answer:

21*21*21=? it's so easy let me do first you are in Instagram

Answer 2

Answer:

21*21*21=9261

identity used here can be (a+b)³=a³+b³+3ab(a+b)

Explanation:

this can be written as

(20+1)³=21³

so (20+1)³=(20)³+1³+3*20*1(20+1)

=8000+1+60(21)

=8000+1+1260

=9261