Equation (9.138) for the signal-to-noise ratio (SNR) of a vector

Equation (9.138) for the signal-to-noise ratio (SNR) of a vector

Equation (9.138) for the signal-to-noise ratio (SNR) of a vector quantizer includes the SNR formula of Equation (3.33) for standard pulse-code modulation as a special case for which k = 1. Justify the validity of this inclusion.