can someone help me with this radical numbers problem?

Question

(2suare root 8)(2-square root 8) would it be 2 square root 4?

Answer 1

I get
4*sqrt8-2*8=4*2sqrt2-16

Answer 2

I have 2 interpretations of your problem:

1. (2 * sqrt 8) (2 * sqrt 8)
2. (2 * sqrt 8 ) (2 - sqrt 8)

I will solve both:

1. (2 * sqrt 8) (2 * sqrt 8) =
4 * 8 = 32.

2. (2 * sqrt 8) (2- sqrt 8) =
4 * sqrt 8 - 2 * 8 =
4 * sqrt (4*2) - 16 =
4 * 2 * sqrt 2 - 16 =
8 * sqrt 2 - 16 =
8(sqrt 2 - 2) = - 4.69.