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Signals and Systems - Engineering

Q1:

A signal is x +f(t) wherex is constant and f(t) is a power signal with zero mean value. The power of the signal is

A x2

B x2 + f2(t)

C more than x2 + f2(t)

D less than x2 + f2(t)

ANS:B - x2 + f2(t)

Please explain?