Using the maximum power transfer theorem

[Amphimos]

Homework Statement

Using the maximum power transfer theorem, find the value of R which will result in the maximum power being delivered to R.

Homework Equations

P_max= (V_oc)^2/4(R_th))
R_L=R_th
P_RL=(V_th/(R_th+R_L))^2*R_L

The Attempt at a Solution

I have no clue where to even begin with changing this circuit to its Thevenin equivalent. I feel like there are 2 unknowns here (power and resistance) and I don't even know where to get started with trying to solve for R.

 

[gneill]

Homework Statement

Using the maximum power transfer theorem, find the value of R which will result in the maximum power being delivered to R.

Homework Equations

P_max= (V_oc)^2/4(R_th))
R_L=R_th
P_RL=(V_th/(R_th+R_L))^2*R_L

The Attempt at a Solution

I have no clue where to even begin with changing this circuit to its Thevenin equivalent. I feel like there are 2 unknowns here (power and resistance) and I don't even know where to get started with trying to solve for R.

What is the usual procedure for finding a Thevenin equivalent?