Question

evaluate the following using a suitable identity: (a) 998³ (b) 10.2³ (x) 9.8³ (x) 998²-4 (e) 999²-1 (f) (-2 5)³ + 10 +15³ (g) 10.2 * 9.8
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Answer 1

Answer:

(a) (998)³

998 can be written as (1000 – 2)

∴ 998 = 1000 – 2

(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

ALL THE OTHER PARTS ARE SAME

Step-by-step explanation:

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Answer 2

Answer:

a) 998

Step-by-step explanation:

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