যদি a + b + c = 0 হয়, তবে a3+b3+ c3 এর মান কত?

A abc

B 3abc

D -3abc

Solution

Correct Answer: Option B

  a + b + c = 0 
⇒ a+b = -c 
⇒ (a+b)3 = (-c)
⇒ a3 + b3 + 3ab(a+b) = -c3 
⇒ a3 + b3 + 3ab(-c) = -c
⇒ a3 + b3 - 3abc = -c3 
 ∴  a3 + b3 + c3 = 3abc 

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