Question

I need help completing this problem ASAP

Answer 1

Answer:

$4\sqrt{5}$

Step-by-step explanation:

Prime factorize 20 and 45

$\sqrt{20}=\sqrt{2*2*5}=2\sqrt{5}\\\\\\\sqrt{45}= \sqrt{5*3*3}=3\sqrt{5}$

$\sqrt{20}-\sqrt{5}+\sqrt{45}=2\sqrt{5}-\sqrt{5}+3\sqrt{5}$

                           $=(2-1+3)\sqrt{5}\\\\\\= 4\sqrt{5}$