Question

solve this problem fast

Answer 1

Answer:

Step-by-step explanation:

7)root 5-2/root 5+2=x

root 5+2/root 5-2=1/x

x+1/x=(root 5-2/root 5+2)+(root 5+2/root 5-2)

        =(root 5-2)^2+(root 5 +2)^2 divided by (1root 5+2)(root 5-2)

         =5-4 root 5+4+5+4+4 root 5/5-4

         =9+9/1

        =18

8)x=root 2 +1

x^2=2+2 root 2+1

x^2+    1/x^2=2+2 root 2+1  +  1/2+2 root 2+1

x^2+    1/x^2=[(2+2root 2+1)^2+1]/2+2 root 2+1

x^2+    1/x^2=6