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12-03-2021
Mathematics

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Rebecca solved
√45 + 2 √20. Her answer was 5 √5 . Is she correct? If not, explain and correct the error.

Rebecca solved 45 2 20 Her answer was 5 5 Is she correct If not explain and correct the error class=

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Аноним Аноним

12-03-2021

No.

[tex]\sqrt{45}=3\sqrt{5} \\2\sqrt{20} =2\sqrt5}[/tex]

If you add them up you DO NOT GET [tex]5\sqrt{5}.[/tex] According to mathematics, it equals to [tex]7\sqrt{5}[/tex].

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