x1+x2=-3/2
x1x2=-2
1/x1+1/x2
=(x1+x2)/x1x2
=(-3/2)/(-2)
=3/4
x1²+x2²
=(x1+x2)²-2x1x2
=(-3/2)²-2*(-2)
=9/4+4
=25/4