Question

evaluate the following using suitable identities (998) ^3​

Answer 1

Step-by-step explanation:

(a-b) ^3= a^3 - b^3 - 3ab(a-b)

(998)^3 can be written as

(1000-2)^3=(1000)^3 - (2)^3 - 3×1000×2(1000-2)

=1000000000 - 8 - 6000(998)

=1000000000 - 8 - 5988000

=1000000000 - 5988008

=994011992

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