Question

Please help I'm confused =(

Answer 1

The answer 10 according to the given foil:
`( \sqrt{5+ √(5) } - \sqrt{5- √(5) })^2\\( \sqrt{5+ √(5) })^2-2 \sqrt{5+ √(5) } \sqrt{5 -√(5) } + (\sqrt{5 -√(5) }) ^2\\5+ √(5) -2(5-5)+5- √(5) =10`