find the cube of 305 by identies.
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Answered by
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305³ = (300+5)³
= (300)³ + (5)³ + 3(300)(5)(300+5)
= 27000000 + 125 + (4500)(305)
= 27000000 + 125 + 1372500
= 28,372,625 Answer.
Identity used:
(a+b)³ = a³ + b³ + 3ab(a+b)
= (300)³ + (5)³ + 3(300)(5)(300+5)
= 27000000 + 125 + (4500)(305)
= 27000000 + 125 + 1372500
= 28,372,625 Answer.
Identity used:
(a+b)³ = a³ + b³ + 3ab(a+b)
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