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NISHANT KUMAR

· started a discussion

· 1 Months ago

q 65 (Question:143208.0)

HOW 3XY(-z) is zero.

Question:
If x+ y = z, then the expression x3 + y3 – z3 + 3xyz will be equal to:
Options:
A) 0
B) 3xyz
C) -3xyz 
D) z3 
Solution:

x + y = z ⇒ x + y + (-z) = 0

∴ x3 + y3 -(z)3 + 3xyz

= x3 + y3 + (-z)3 – 3x.y(-z) = 0

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