(a1+d)+(a1+5d)=16 2a1+6d=16 a1+3d=8
a1*(a1+3d)=-32
a1*8=-32
a1=-4 -4+3d=8
3d=8+4
3d=12
d=4
a15=a1+(15-1)d=-4+14*4=-4+56=52
a15=52
a4=a1+3d
a2=a1+d
a6=a1+5d
a15=a1+14d=-4+14*4=52
(a1+d)+(a1+5d)=16 2a1+6d=16 a1+3d=8
a1*(a1+3d)=-32
a1*8=-32
a1=-4 -4+3d=8
3d=8+4
3d=12
d=4
a15=a1+(15-1)d=-4+14*4=-4+56=52
a15=52
a4=a1+3d
a2=a1+d
a6=a1+5d
a15=a1+14d=-4+14*4=52