2. Use Routh-Hurwitz criterion to judge the stability of the polynomial: tell how many poles on right, left or on the jw-axis of the s-plane. s^4+2s^3+60s^2+20s+500

The graph of the function f(x) = (x + 2)(x + 6) is shown below. which statement about the function is true? the function is positive for all real values of x where x > –4. the function is negative for all real values of x where –6 < x < –2. the function is positive for all real values of x where x < –6 or x > –3. the function is negative for all real values of x where x < –2.