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If x = 7 + 4 sqrt(3), y = 7 - 4 sqrt(3),...

If x = 7 + `4 sqrt(3)`, y = 7 - `4 sqrt(3)`, find the value of `(1)/(x^(2)) + (1)/(y^(2))`.

A

194

B

198

C

212

D

318

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The correct Answer is:
A
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MCGROW HILL PUBLICATION-SURDS AND INDICES-MULTIPLE CHOICE QUESTIONS
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  10. If x = 7 + 4 sqrt(3), y = 7 - 4 sqrt(3), find the value of (1)/(x^(2))...

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  11. If x = 3 + sqrt(8) , y = 3 - sqrt(8), find the value of x^(-3) + y^(-3...

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  12. If x = 3 + sqrt(8) find the value of x^(4) + (1)/(x^(4))

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  14. If sqrt(x)+sqrt(y)=sqrt(18+6sqrt(5)), find the value of x.

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