if d equation x^3+3px^2+3qx+r=0 and x^2+2px+q=0have a common root ,then 4(p^2-q)(q^-pr)=?
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if d equation x^3+3px^2+3qx+r=0 and x^2+2px+q=0have a common root ,then 4(p^2-q)(q^-pr)=?
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Hint: Note the discriminant of the quadratic is
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