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which of the following are quadratic equ...

which of the following are quadratic equations?
`"(i) " x-5/x=3x-9 " (ii) " (x+3)(x-4)=0`
`"(iii) " 5/x-3=x^(2) " (iv) " n^(3)-n+4=n^(3)`
(v) `x-3=4x^(2)`

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The correct Answer is:
(i),(ii) and (v) are quadratic equations.
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