Inverting Adder

[pwm_111]

Hello! I am trying to answer the following question:

Design an circuit with operational amplifiers that has the following output function:

Vo=2*V1+10*V2+11*V3-V4

Shoud i use the inverting adder?

Using three different voltage sorces V1,V2,V3 and V4 ,an OpAmp and a 4 resistors(R1 to R4) and a feedbak resistor.

So the expression for the output of and adding inverter is given by:

V0=-(Rf/R1)-(Rf/R2)-(Rf/R3)-(Rf/R4)

So i could use Rf=10k ,R1=5k,R2=1k,R3=1,1k and R4=10k

The problem is then Vo=-2V1-10V2-11V3-V4....Shoud i use and non-inverting adder,conecing the resistors to the non-inverting input?

Thanks