Question

(28)^3 by using (a + b)^3

formula​

Answer 1

what should we find?? didn't understand

Answer 2

Answer:

(a+b) ^3=(20+8) ^3

by the identity:[ (a+b) ^3= a^3+b^+3ab(a+b) ]

=(20)^3 + (8) ^3 + 3(20) (8) (20+8)

=60+24+480(28)

=60+24+13440

=13528. Ans