Question

If x=√5+2 then find the value of x²-1/x²

Answer 1

Answer:

399/20

Step-by-step explanation:

x=√5+2

X2= 5*4=20

1/X2=1/20

x2-1/X2=20-1/20

400/20-1/20

399/20

Answer 2

Answer:

i do not know the answer