Please Provide short cut (Question: 259989.0 )

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Shashank Shah

· started a discussion

· 1 Months ago

Please Provide short cut (Question: 259989.0 )

This method is not suitable for exam

Question:

If $\frac{y}{x} - \frac{x}{y} = 3,$ , then find the value of $\frac{x^{3}}{y^{3}} + \frac{y^{3}}{x^{3}}$ is-

Options:

10 $\sqrt{3}$

10 $\sqrt{13}$

13 $\sqrt{3}$

13 $\sqrt{10}$

Solution:

Ans: (b)

Abhishek Kothari

· commented

· 1 Months ago

put x=1 and you will get y-1/y = 3 ; now the ques. asked is find x^3/y^3 + y^3/ x^3 i.e Y^3 +1/Y^3..

Tushar Rawat

· commented

· 1 Months ago

thanks anil

Anil

· commented

· 1 Months ago

let x/y=a. then y/x=I/a. now solve as a3+1/a3

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