Node voltages in the first-order op-amp circuit
Your question is ambiguous.  First, you haven't placed a sign convention on the capacitor, so it's not clear which side is 4V with respect to the other side.

Next, in initial value problems, one should really understand EXACTLY what happens at time t=0, and that isn't clear at all here.  This is often handled by including a switch that closes at t=0 in the circuit.

If this is some sort of HW, a clearer question would be better.