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Question

What is (xy)3?


  1. x3y3+3xy(xy)

  2. x3+y33xy(x+y)

  3. x3y33xy(xy)

  4. x3+y3+3xy(x+y)


Solution

The correct option is C

x3y33xy(xy)


We have the identity:

(ab)3=a3b33ab(ab)

By replacing a by x and b by y, we get

(xy)3=x3y33xy(xy)

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