The quadratic equation ax^(2)+bx+c=0 has...

The quadratic equation `ax^(2)+bx+c=0` has real roots if:

`alt-1,0ltclt1,bgt0`

`alt-1,-1ltclt0,0ltblt1`

`alt-1,clt0,bgt1`

`agt0,bgt0,cgt0`

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