If y = ax^(2)+bx + c = 0 where a,b,c ...

If ` y = ax^(2)+bx + c = 0 ` where a,b,c are arbitrary constants then the differential equation is :

`y''' +y'' = 0 `

`y'' = 2a`

`y''' = 0 `

` y'' - y = 0 `

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