2. Design/sketch an amplifier circuit that implements the following function: Vo=4V1+V2 - 2V3 - 8V4 using only 1k resistors (you can combine them in series and parallel). 3. Design/sketch an amplifier circuit that implements the following function: Vo 10V1-3V2 - - = Calculate the output if: V₁ = 0.5 cos (1000t) V and V2 = 1V (dc) Build your circuit in Multisim (using the OPAMP_3T_VIRTUAL op-amp model) and show that you calculation is correct (explain how you know that it is correct).