Question

What's the answer to both when simplifying the two radical expression?

Answer 1

`( √(x) +2 √(5))*( √(x) -2 √(5)) = \\ \\ ( √(x))^2- (√(x) *2 √(5))+(2 √(5)* √(x)) -(2 √(5))^2 = \\ \\ x- 2√(5) √(x)+2 √(5) √(x) -(4*5)= \\ \\ x -(4*5)= \boxed{x-20} \\ \\`


`( √(x)+ √(5)) ^2= \\ \\ ( √(x))^2+2* √(x)* √(5) + (√(5)) ^2= \\ \\ \boxed{ x +2 √(5x)+5}`