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Which one of the following is a quadrati...

Which one of the following is a quadratic equation? a)`5/x-3=x^2` b)`x(x+5)=2` c)`n-1=2n` d)`1/x^2(x+2)=x`

A

`5/x-3=x^2`

B

`x(x+5)=2`

C

`n-1=2n`

D

`1/x^2(x+2)=x`

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