Question

find the above questions answer if x=4-root15​

Answer 1

Answer:

8

Step-by-step explanation:

x= 4-√15

x+1/x = 4-√15 + 1/4-√15

now rationalize the denominator of the 2nd term that is 1/4-√15

1/4-√15×4+√15/4+√15 (a²-b²)

we get 4+√15

x+1/x= 4-√15+4+√15

=8

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Answer 2

Answer:

There is no use of value of x

Step-by-step explanation:

Just use binomial expansion rule and answer is here