Question

x+1/x=7 then x^3+1/x^3 please help me tomorrow I has exam​​

Answer 1

Step-by-step explanation:

$x + \frac{1}{x} = 7$

$cubing \: on \: both \: sides$

${x}^{3} + \frac{1}{ {x}^{3} } + 3(x + \frac{1}{x} ) = 343$

${x}^{3} + \frac{1}{ {x}^{3} } + 3(7) = 343$

${x}^{3} + \frac{1}{ {x}^{3} } + 21 = 343$

${x}^{3} + \frac{1}{ {x}^{3} } = 343 - 21$

${x}^{3} + \frac{1}{ {x}^{3} } = 322$

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Answer 2

Answer:

x=1/6

Step-by-step explanation:

x+1=7x

1= 7x-x

1=6x

x=1/6