Analogue Electronics

Design a single op-amp circuit to produce an output voltage V (10 V 15 V 27 V ) o 1 2 3 = − ⋅ + ⋅ + ⋅ from three input signals V1, V2 & V3. Assume the op-amp is ideal, calculate the resistances required if the minimum resistance to be used is 10 k
, and draw the circuit diagram.