Order the frequencies from lowest to highest. express the initial condition of (b) above as a sum of the modal vectors associated with the lowest and the highest frequencies. using plots show that the response obtained in (b) is the sum of the modal responses arising from the lowest and the highest frequency modes g

step-by-step explanation:

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it is x=-4

step-by-step explanation:

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answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb