How to simplify a radical by rationalizing the denominator

What is the initial expression discussed in the video?

• Square root of 30 over square root of 6

• Square root of 15 over square root of 3

• Square root of 25 over square root of 4

• Square root of 20 over square root of 5

Which of the following is a square number?

• 16

• 10

• 14

• 7

What is the largest square number that divides 20?

• 9

• 16

• 4

• 1

How can the expression be rewritten after simplification?

• Square of 5 times radical 5 over radical 5

• Square of 4 times radical 5 over radical 5

• Square of 3 times radical 5 over radical 5

• Square of 2 times radical 5 over radical 5

What is the importance of staying attentive during the lesson?

• To impress the teacher

• To get extra credit

• To finish the lesson quickly

• To avoid missing important concepts