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जाँच कीजिए कि निम्न द्विघात समीकरण है...

जाँच कीजिए कि निम्न द्विघात समीकरण है या नहीं :
` (i) (x-2) ^(2) +1=2x-3`
`(ii) X(x+1)+8=(x+2)(x-2)`
`(iii) x(2x+3)=x^(2)+1`
`(iv) (x+2)^(3)=x^(3)-4`

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