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If a,b,c,depsilon R and f(x)=ax^3+bx^2-c...

If `a,b,c,depsilon R and f(x)=ax^3+bx^2-cx+d` has local extrema at two points of opposite signs and `abgt0` then roots of equation `ax^2+bx+c=0` (A) are necessarily negative (B) have necessarily negative real parts (C) have necessarily positive real parts (D) are necessarily positive

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