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almond37 [142]
3 years ago
11

Factor completely. n ^4 - 1

Mathematics
2 answers:
inna [77]3 years ago
8 0
(n^4 - 1) = (n^2 - 1) (n^2 +1) = (n - 1) (n + 1) (n^2 + 1)
IgorC [24]3 years ago
4 0

Answer: Hello there!

here we have the equation n^4 - 1

using the relation: (a^{2} - b^{2}) = (a+b)*(a-b)

we can write our equation as:

(n^{4} - 1) = ((n^{2} )^{2} -1^{2} ) = (n^{2} + 1)(n^{2} - 1) = (n^{2} + 1)(n + 1)(n-1)

and (n^2 + 1) has only complex roots, i and - i, then we can factorize this as (n -i)(n + i) = n*n + ni - ni (+i)*(-i) = (n^2 + 1)

then our equation is: (n^{2} + 1)(n + 1)(n-1) =  (n + i)(n - i)(n + 1)(n-1)

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