Question

Subtract the following radicals: 5√45 - 3√5
A. 5√5
B. 12
C. 12√5
D. 42√5

Answer 1

Hint √45 = √9 √5

Answer 2

that doesnt help me

Answer 3

whats √9 equal to ?

Answer 4

3

Answer 5

right so √45 = 3√5
so replace √45 by 3√5 and see what you get

Answer 6

5√45 = 5*3√5 = 15√5 right?

Answer 7

now you get
15√5 - 3√5 which is easy to work ou