If A=[abcd], where a,b,c,d are the roots of the equation x4−13x3+px2 – InterviewSolution

1.	If A=[abcd], where a,b,c,d are the roots of the equation x4−13x3+px2+qx−64=0, p,q∈R whose three roots are positive and one is negative, then the minimum positive value of det(A) is
Answer» If $A = [\begin{matrix} a & b c & d \end{matrix}],$ where $a, b, c, d$ are the roots of the equation $x^{4} - 13 x^{3} + p x^{2} + q x - 64 = 0,$ $p, q \in R$ whose three roots are positive and one is negative, then the minimum positive value of $det (A)$ is

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