If P(x)=x3+px+qP(x) = x^3 + px + qP(x)=x3+px+q has roots r1,r2,r3r_1, r_2, r_3r1,r2,r3, which expression equals r13+r23+r33r_1^3 + r_2^3 + r_3^3r13+r23+r33 by Newton's identities?
−3q-3q−3q
3q3q3q
−p3−3q-p^3 - 3q−p3−3q
p3−3qp^3 - 3qp3−3q