x4 +px3 +rx +s2 is perfect squre then ps
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yes it's perfect square x^4+px^3+qx^2+rx+s is a perfect square then rs=---- -? abdTgZ ... p = 2a. q=a^2+2s^1/2 =p^2/4 + 2(s)^1/2 So, s^1/2=4q-p^2/8. r=2as^1/2=ps^1/2. rs = ps^3/2 ...
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