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  1. If x + y = z, then the expression x3 + y3 - z3 + 3xyz will be equal to :
    1. 0
    2. 3xyz
    3. –3xyz
    4. z3
Correct Option: A

Using Rule 20,
x + y = z ⇒ x + y + (–z) = 0
∴ x3 + y3 - z3 + 3xyz = x3 + y3 + ( - z )3 – 3x.y (–z) = 0


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