Question

Please solve the 44th question

Answer 1

x+1/x=7-------(1)
${(x + \frac{1}{x} )}^{3} = {7}^{3}$
x³+1/x³+3(x)(1/x)(x+1/x)=343
x³+1/x³+3(7)=343{from(1)}
x³+1/x³=343-21=322.
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Answer 2

see the pic for the ans