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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`

Text Solution

Verified by Experts

The correct Answer is:
(i),(ii), (vii) and (viii)
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(x^(2)-7x+12)/(2x^(2)-4x+5)>0

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