Verified answer

You can expand this expression into a polynomial.

Think of it as multiplying: (4√2 -1)(4√2 -1).

You get:

32 - 8√2 + 1

Then add like terms:

33 - 8√2

(4√2-1)^2

(4√2-1)(4√2-1)

16√4 - 4√2 - 4√2 + 1

16(2) - 8√2 + 1

33 - 8√2

There you go