Question

pls do this. by evaluating with identity​

Answer 1

Step-by-step explanation:

There fore. 999 cube=997002999

Answer 2

Answer:

(1000-1)³

as 1000-1 = 999

» (1000-1) ³ [as (a-b) ²= a³ - b² -3ab(a-b)

» 1000³ - 1³ - 3(1000)(1) (1000-1)

» 1000000000 -1 - 3000(999)

» 1000000000-1 - 2997000

» 997002999

here ⬆ is your answer

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