If P(x)=x4+ax3+bx2+cx+dP(x) = x^4 + ax^3 + bx^2 + cx + dP(x)=x4+ax3+bx2+cx+d has roots α,β,γ,δ\alpha, \beta, \gamma, \deltaα,β,γ,δ, what is α2+β2+γ2+δ2\alpha^2+\beta^2+\gamma^2+\delta^2α2+β2+γ2+δ2 in terms of a,ba, ba,b?
a^2 - 2b
a^2 + 2b
b^2 - 2a
a - b