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If b^(2)gt4ac then roots of equation ax^...

If `b^(2)gt4ac` then roots of equation `ax^(4)+bx^(2)+c=0` are all real & distinct if :

A

`blt0,alt0,cgt0`

B

`blt0,agt0,cgt0`

C

`bgt0,agt0,cgt0`

D

`bgt0,alt0,clt0`

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