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c1 question on finding value of n for Un

Hi people, I have given the equation below..

Un= (-1)^n n/n+4, Un = 7/9

please could somebody show me how to work it out...
Reply 1
Avatar for jakash
jakash
12
If 7/9 is positive, then you know n must be an even number, for the (-1)^n part to also be positive.
Then, to find n, you basically need to solve n/n+4 = 7/9 for n.
(Hint: multiply through by n+4 and 9)
Reply 2
Avatar for Lj345
Lj345
OP
jakash
If 7/9 is positive, then you know n must be an even number, for the (-1)^n part to also be positive.
Then, to find n, you basically need to solve n/n+4 = 7/9 for n.
(Hint: multiply through by n+4 and 9)


Hi I dont get how to answer the question I need somebody to show me how exactly how to answer this via step by step because i am confused about this question.. And i learn better by being shown how I question is done so I can attempt the rest in my exercise book.

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