Question

a=1-root 2 find ( a - 1/ a) ^3​

Answer 1

Step-by-step explanation:

a= 1-√2 = -√2+1.

1/a = 1 / (-√2+1)

= (-√2-1) / (-√2-1)(-√2+1) = -√2 -1 / (2-1)

= -√2 -1.

a-1/a = (-√2+1)-(-√2-1) = 2.

therefore ( a - (1/a) ) 3= 23 =2x2x2 =8.

HOPE THIS HELPS BUDDY