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If 3a+(1)/(3a) = 2sqrt3 , evaluate: ...

If ` 3a+(1)/(3a) = 2sqrt3` , evaluate:
` 9a^(2) +(1)/( 9a^(2))`

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The correct Answer is:
` 10 `
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ICSE-CHAPTER REVISION (STAGE 2) -COMPOUND INTEREST
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  8. If x^(2) + y^(2) = 37 and xy = 6, find x+y

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  9. If x^(2) + y^(2) =37 and xy = 6 : find x-y

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  10. If x^(2) + y^(2) = 37 and xy = 6, find x^(2) - y^(2)

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  11. If 3a+(1)/(3a) = 2sqrt3 , evaluate: 3a- (1)/(3a)

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  12. If 3a+(1)/(3a) = 2sqrt3 , evaluate: 9a^(2) +(1)/( 9a^(2))

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  13. If 3a+(1)/(3a) = 2sqrt3 , evaluate: 81 a^(4) + (1)/(81a^(4))

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  14. Expand : (2x- y + 2)^(3)

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  15. Expand : (x-2y + 6)( x-2y -6) .

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  18. If a+ b =1 and a-b =7, find : ab

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  19. If x ne 0 and 3x +(1)/(3x)= 8, find the value of :27 x^(3) + ( 1)/(...

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