please solve this

Asked by futureentrepreneur | 30th Sep, 2008, 05:29: PM

Expert Answer:

we know that a3+b3+c3 = (a+b+c)(a2+b2+c2-ab-bc-ac)

put a=23   , b=-15   ,c=-13

(23)3 + (- 15)3 + (- 13)3 = (23-15-13)( (23)2 + (- 15)2 + (- 13)2 +23*15- 13*15+23*13)

=(-5)(1372)

= -6860

Answered by  | 30th Sep, 2008, 08:40: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.