The expression 2 √50 - √2 is equivalent to

Question

1. 2 √48
2. 10
3. 9 √2
4. 49 √2

Answer 1

sqrt(50)= sqrt(2*25) = sqrt(2)*sqrt(25) = 5*sqrt(2)

2 sqrt(50) - sqrt(2) =

2 *5*sqrt(2) - sqrt(2) =

10*sqrt(2) - 1*sqrt(2) =

9*sqrt(2)

option 3