Find the length of the missing side. Give your answer in the simplest radical form.

Answer:
x = [tex]2\sqrt{5}[/tex]
Step-by-step explanation:
Use Pythagorean theorem,
Hypotenuse² = base² + altitude²
x² = (√8)² + 4²
= 8 + 16
= 20
x = √20 = [tex]\sqrt{2*2*5} = 2\sqrt{5}[/tex]
x = [tex]2\sqrt{5}[/tex]