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Without solving , comment upon the natur...

Without solving , comment upon the nature of roots of each of the following equations :
(i) `7x^(2)-9x+2=0`
(ii) `6x^(2)-13x+4=0`
(iii) `25x^(2)-10x+1=0`
(iv) `x^(2)+2sqrt(3)x-9=0`
(v) `x^(2)-ax-b^(2)=0`
(vi) `2x^(2)+8x+9=0`

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