a+b =

-1-

-2-

 

a =3/b

(3/b)² -b²=8

9/b² -b²=8

9 -b⁴ =8b²

b⁴ +8b² -9=0

(b² +9)(b² -1)=0

b²=-9 b=i ×

b² =1

b=-+1 ✓

a =3 a=-3

a+b =3+1=4

a+b =-3-1=-4

-3-

-4-