3 years ago

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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