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  1. Given that x3 + y3 = 72 and xy = 6 with x > y. Then the value of (x – y) is
    1. 4
    2. – 4
    3. 2
    4. – 2
Correct Option: C

x3 + y3 = 72
x3 + y3 = 64 + 8 = 43 + 23
∴ x = 4, y = 2 ⇒ xy = 8
∴ x – y = 4 – 2 = 2


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