Operational Amplifier solving problem

 Problem 5.14:Find Vo in the circuit (In this session we will try to solve the operation amplifier related math of Alexander Sadiku book chapter 5 

Solution :

But V2=0. Hence 40-4V1 =V1 +2V1-2Vo

Then we have, 7V1-2Vo...........(1)

At node 2 we have 

(V1-V2)/20 =(V2-Vo)/10,

Here we know, V2= 0 for ideal concept 

After put V2=0 then 

V1 = -2Vo...............................(2)

Now equating (1) &(2) we have

Vo= -2.5 V