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If b^2>4a c then roots of equation a x^4...

If `b^2>4a c` then roots of equation `a x^4+b x^2+c=0` are all real and distinct if: ` (a) `b<0,a<0,c>0` (b) `b<0,a>0,c>0` (c) `b>0,a>0,c>0` (d) `b>0,a<0,c<0``

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