Descartes' Rule of Signs

Algebra Level 1

The function f(x)=x4+ax3+bx2+cx+df(x)=x^4+ax^3+bx^2+cx+d has four positive roots. We are also given that (ba)(a+b)+(dc)(c+d)=2(acbd).(b-a)(a+b)+(d-c)(c+d)=2(ac-bd).

What is the value of (a+b+c+d)2?(a+b+c+d)^2?

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