Mathematics, 12.07.2019 06:10, Jeli4264

Let x1,x2,x3 and x4 denote the four roots of the equation x^4 +kx^2+90x-2009=0. if x1x2=49. find the value of k.

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Let x1,x2,x3 and x4 denote the four roots of the equation x^4 +kx^2+90x-2009=0. if x1x2=49. find the...