Question

What is the value of x? Leave your answer in simplest radical form.

Answer 1

Answer:

Step-by-step explanation:

As it is right angle, we can use Pythagoras theorem.

x²  = 2² + 4²

    = 4 + 16

x² = 20

x = √20 = √2*2*5

x = 2√5

Answer 2

Answer:

Option 4

Step-by-step explanation:

x² = 4² + 2²

x² = 20

x² = 2²×5

x = 2sqrt(5)