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## Homework Statement

I need to resolve this network and find the equation for voltage at some time, t'>0. I know how to find the equation, but I'm having trouble finding the value for tau because I'm not sure what the equivalent resistance is.

## Homework Equations

tau = R*C

R1 = 4 k ohms

R2 = 7 k ohms

R3 = 2 k ohms

C = 101 microF

## The Attempt at a Solution

I've tried resolving the resistors in different ways, but I can't seem to figure out how they combine to find R equivalent.

I'm just looking for a hint as to how the total resistance can be found when t > 0.

Thanks!