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Step-by-step explanation:

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

So, a^2 = n^16, therefore a = square root of n^16

So = n^4

Now, b^2 = 9, so, b = square root of 9 = 3

So a = n^4

And b = 3

Now let's substitute everything

(a+b) (a-b) = (n^4 + 3)(n^4 - 3)

other answer is correct. i had used the radius of the radius somehow. a website: