Question

have a dout plz............

Answer 1

(x - 1/x)^3 = [(x^2 -1) /x]^3
=>[(1 - 2√2 + 2 - 1) / 1 + √2]^3
simplifying
[-2 ×(1-√2) /(1 - √2)]^3
#1 -√2 gets neutralized#
[-2]^3
= -8...