Question

if a2+1/a2=7, find
i)a+1/a
&
ii)a-1/a​

Answer 1

Answer:

a+1/a= +- 3,a-1/a= +-(root 5)

Step-by-step explanation:

i)a+1/a -------> square it we get

a2+1/a2+2=7+2=(a+1/a)2

a+1/a= +-3

same for a-1/a we get

7-2=(a-1/a)2

a-1/a= +-(root 5)