Question

please answer this question...​

Answer 1

Given : (998)³

★  998 can be written as (1000 - 2)

$\longrightarrow$  (1000 - 2)³

★  (a - b)³ = a³ - 3a²b + 3ab² - b³

Here : a = 1000 and b = 2

$\longrightarrow$  1000³ - 3(1000)²(2) + 3(1000)(2)² - 2³

$\longrightarrow$  1000000000 - 6(1000)² + 12(1000) - 8

$\longrightarrow$  1000000000 - 6000000 + 12000 - 8

$\longrightarrow$  994000000 + 12000 - 8

$\longrightarrow$  993999992 + 12000

$\longrightarrow$  994011992

$\longrightarrow$  998³ = (1000 - 2)³ = 99401192

Answer 2

Step-by-step explanation:

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