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  1. x2 + y2 + z2 = 14 and xy + yz + zx = 11, then the value of (x + y + z)2 is
    1. 16
    2. 25
    3. 36
    4. 49
Correct Option: C

Given,
x2 + y2 + z2 = 14
xy + yz + zx = 11
∴  (x + y + z)2 = x2 + y2 + z2 + 2(xy + yz + zx)
= 14 + 2 × 11
= 14 + 22 = 36


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