For the circuit in Fig. P4.21,(a) find Vo in terms of V1 and V2.(b) If V1 = 2 V and V2 = 6...

For the circuit in Fig. P4.21,

(a) find Vo in terms of V1 and V2.

(b) If V1 = 2 V and V2 = 6 V, find Vo.

(c) If the op-amp supplies are ±12 V, and V1 = 4 V, what is the allowable range of V2?

Figure P4.21