(i)If ax^2+bx+c=0 has equal roots, then ...

(i)If `ax^2+bx+c=0` has equal roots, then c=
(ii) if the equation `ax^2+2x+a=0` has two distinct roots, if.
(iii) The positive value of k for which the equation

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4)`ax^2+bx+c=0`
`D=0`
`D=b^2-4ac`
`b^2-4ac=0`
`c=b^2/(4a)`
5)`ax^2+2x+a=0`
`D>0`
`b^2-4ac>0`
...

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