if X + y + z = 0 show that x power 3 + y power 3 + z power 3 = 3 x y
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Answer:
x+y+z=0
⟹x+y=−z
Cubing on both sides
(x+y) 3 =(−z) 3
⟹x 3 +y 3 +3x 2 y+3xy 2 =−z 3
⟹x 3 +y 3 +3xy(x+y)=−z 3
⟹x 3 +y 3 +3xy(−z)=−z 3
⟹x 3 +y 3 −3xyz=−z 3
⟹x 3 +y 3 +z 3 =3xyz
Step-by-step explanation:
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