you can use the Pythagorean theorem to solve this [tex]{x}^{2} = {4}^{2} + {2}^{2} [/tex] Now solve for x [tex] {x}^{2} = 16 + 4 \\ {x}^{2} = 20 \\ x = \sqrt{20} [/tex] Now you can simplify this to [tex]x = \sqrt{5 \times 4} \\ x = \sqrt{5} \sqrt{4} \\ x = \sqrt{5 } \times 2 \\ x = 2 \sqrt{5} [/tex] And that's your answer
