Question

okay

Answer 1

\[(a+b)(a-b)= a^2- b^2\]

Answer 2

a=4 and b= sqrt 8.

Answer 3

\[(4+\sqrt{8)}(4-\sqrt{8})\]
The formula that "completeidiot" put is right if you say "4" is a and "sqt8" is b
but the full way would be distributive property

Answer 4

By his solution the answer would be
4^2 - sqt8^2
(4+√8)(4-√8)
You use FOIL
First by First, [Outer by Outer + Inner by Inner], Last by Last.
4x4 + (4 x - sqt8 + sqt8 x -4) 4 x sqt 8

Answer 5

\[16-4\sqrt{8}+4\sqrt{8}+\sqrt{8^{2}}\]
collect like terms: 4 sqt 8 cancel eachother out
Now we're back to
16 - sq8^2