Question

If a^4 = a^2 - 1, then a^2 + 1/a^2 =?​

Answer 1

=-2

Step-by-step explanation:

a^4=a^2 -1

a^4-a^2=-1

a^2=-1

a^2+1/a^2

=-1+1/-1

=-1-1

=-2