Tips & Tricks GIVEN: (x–3)2+(y+5)2+(z–2)2=0 FORMULA USED: If x + y + z = 0, then x3+y3+z3=3xyz CALCULATION: Sum of square will be zero ‘0’ only and when they are individually zero ‘0’. x–3=0 ⇒ x = 3And, y + 5 = 0 ⇒ y = -5 And, z – 2 = 0 ⇒ z = 2 Since x+y+z=3+(−5)+2=0 Hence, x3+y3+z3=3xyz =3×3×(−5)×2=−90