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Galina-37 [17]
3 years ago
10

I need help completing this problem ASAP

Mathematics
1 answer:
prisoha [69]3 years ago
4 0

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}\\

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