Why is this the answer? The circuit shown has a feedback resistor (R2) equal to

Question

Why is this the answer?

The circuit shown has a feedback resistor (R2) equal to 120 ohms. The three sources have values of V1 = -2V, V2 = 6V, and V3 = 7V and are connected to the amp through resistors of R = 100 ohms. Your goal is to adjust the output voltage by changing either R or R2. Which change has a greater effect, and by how much? Changing R2 has the greater effect. Its effect is about 20% stronger than changing R. Changing R has the greater effect. Its effect is about 20% stronger than changing R2. Changing R2 has the greater effect. Its effect is about 60% stronger than changing R. Changing R has the greater effect. Its effect is about 60% stronger than changing R2.

Explanation / Answer

Changing R is greatest effect it's effect is about 20% stronger than changing R2 because

Vout directly proportional to the R2/R

The resistor R is in the denominator so it's changing effect is high it's around 20% geater than R2

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