a - 1/a = 2
a^2-2a-1 = 0
a = 1±√2
Now just square that and you get 8
If a - 1/a = 2 then show that
( a + 1/a )^2 = 8
1 answer
( a + 1/a )^2 = 8
1 answer
1 answer
1 answer
1 answer
1 answer