Question

(998)³=(1000-2) using identity
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Answer 1

Answer:

994011992

Step-by-step explanation:

(998)3 = (1000 – 2)3

We know the formula

(a – b)3 = a3 – b3 – 3ab(a – b)

(1000 – 2)3 = (1000)3 – (2)3 – 3 × 1000 × 2(1000 – 2)

(998)3 = 1000000000 − 8 – 5988000

(998)3 = 994011992

Answer 2

998³ = (1000-2)³

using identity - a³-b³-3ab(a-b)

1000³-2³-3(1000)(2)[1000-2]

= 1000000000-8-6000000+12000

= 994011992

Hope it helps you