Question

Using a suitable identity, find the value of (98)3
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Answer 1

Answer:

Cube of 98:

98 = (100 – 2)

Identity:

(x–y)³ = x³–y³+3xy²–3x²y

therefore, (100–2)³ = 100³–2³+3(100)(2)²–3(100)²(2)

therefore, (100–2)³ = 1000000–8+1200–60000

therefore, (100–2)³ = 9,41,192..

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