The correct option is D 91125(45)3 = (40 + 5)3 = (40)3 + 53 + 3 40 5 (40 + 5) = 64000 + 125 + 600(45) = 64125 + 27000 = 91125 ...

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Byju's Answer

Standard IX

Mathematics

Expansion of (a ± b)³

Cube of 45 is

Question

Cube of 45 is

37125

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37005

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90005

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91125

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Solution

The correct option is D
91125

(45)³ = (40 + 5)³= (40)³ + 5³ + 3 40 5 (40 + 5)

= 64000 + 125 + 600(45)

= 64125 + 27000 = 91125

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