The total number of fans who went to watch professional soccer games in the last decade can be modeled by the function f(x)=x3+9x2+23x+15 and the number of professional soccer games played in this time period can be modeled by g(x)=x+5 , where x is the number of years.

a

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

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step-by-step explanation: