It's actually a maximum power question, but I'm suspecting that my answer is wrong...it's a past exam question and no solution was given.

For V open circuit, using Va as the top mode, Vb as above 4Ohm resister, Vc as top right, and bottom as reference node, I got

giving me -1380V, -480V, -930V, and the Vopen would be -930V (I'm thinking that this is wrong...of course)

For I short circuit, using bottom left as Ia, Bottom right as Ib, and top as I3

givin me 86.38A, 84.54A, 70.91A, and the Ishort would be 84.54A

(Rth = -11Ohm, Max power = -78.6k using my values...)

For V open circuit, using Va as the top mode, Vb as above 4Ohm resister, Vc as top right, and bottom as reference node, I got

**Va = 60 + 3Vb**(At Va)**11Vb - 6Vc = 0**(At Vb)**2Vc - Va - Vb = 0**(At Vc)giving me -1380V, -480V, -930V, and the Vopen would be -930V (I'm thinking that this is wrong...of course)

For I short circuit, using bottom left as Ia, Bottom right as Ib, and top as I3

**-10Ia + 4Ib + 6Ic = -100**

4Ia - 6Ib + 2Ic = -20

18Ia - 10Ib - 10Ic = 04Ia - 6Ib + 2Ic = -20

18Ia - 10Ib - 10Ic = 0

givin me 86.38A, 84.54A, 70.91A, and the Ishort would be 84.54A

(Rth = -11Ohm, Max power = -78.6k using my values...)

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