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Which of the following are quadratic equ...

Which of the following are quadratic equations?
(i)`x^(2)8x+12=0` (ii) `x+(1)/(x)=5` (iii) `x+(5)/(x)=x^(2)`
(iv) `x^(2)-5sqrtx+7=0` (v) `x^(2)-5x-sqrtx+4=0` (vi) `x^(2)-(1)/(x^(2))=4`
(vii) `5x^(2)-7x=3x^(2)-7x+3` (viii) `(1)/(4)x^(2)+(7)/(6)x-2=0`

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The correct Answer is:
(i),(ii), (vii) and (viii)
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NAGEEN PRAKASHAN-QUADRATIC EQUATIONS-Exercise 4a
  1. Which of the following are quadratic equations? (i)x^(2)8x+12=0 (ii)...

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  2. Represent the following situations mathematically: (i) John and Jiva...

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  3. Which of the following are roots of 4x^(2)-9x-100=0? (i) -4 (ii) (3)...

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  4. If one root of the quadratic equation 6x^(2)-x-k=0" is" (2)/(3), then ...

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  5. Solve each of the following equatins : 3x^(2)-243=0

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  6. Solve each of the following equatins : 5x^(2)+4x=0

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  7. Solve each of the following equatins : x^(2)+12x+35=0

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  8. Solve each of the following equatins : 2x^(2)-5x+3=0

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  9. Solve each of the following equatins : 6x^(2)-x-2=0

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  10. Solve each of the following equatins : x=8x^(2)-22x-21=0

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  11. Solve each of the following equatins : 9x^(2)+6x+1=0

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  12. Solve each of the following equatins : 48x^(2)-13x-1=0

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  13. Solve each of the following equatins : 6x^(2)+40=31x

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  14. Factorize sqrt3x^2+11x+6sqrt3

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  15. Solve each of the following equatins : 3sqrt7x^(2)+4x-sqrt7=0

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  16. Solve each of the following equatins : 2sqrt5x^(2)-3x-sqrt5=0

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  17. Solve each of the following equatins : x^(2)+5=(9)/(2)x

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  18. Solve each of the following equatins : x=(3x+1)/(4x)

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  19. Solve each of the following equatins : x+(1)/(x)=2.5

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  20. Solve each of the following equatins : 5x-(35)/(x)=18,xne0

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