An investment of 8000 in a certain certificate of deposit doubles in value every several year. The function that models the growth of this investment fx)=8000x2 to the x power, where x is the number of doubling periods. If the Investor does not withdraw any money form his CD, how much money will be available for withdraw after 28 years.

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb

the answer is d

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the answer is a. q=6,r=6√2

step-by-step explanation: