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## Homework Statement

For the Circuit shown below, design the opamp circuit which will give an output of -25V

For the cicruit shown, calculate Vs

## The Attempt at a Solution

Ok, for the first one, I summed the resistances in parallel and found that the the voltage 4 ohm resitor thats that would act as the voltage divider would have a value of 2 ohm, which means the volatge input using the voltage divider rule would be 2v, however the answers states that it is 0.5V

For the second question, , the 5V across the 1 ohm resistor, being in series with the other 1 ohm resistor, suggests that the sum of the voltages in that mini circuit is 10V. Resistors in parallel have the same voltage across, therefore, 10V across the 4ohm resistor. By the voltage divider rule, there should be 50V across the 16ohm resistor. Not sure how to go from here, ive tried playing around with figures for the other 2 in parallel and the 3ohm, and get nowhere near the answer of 164.48ohms

HELP!