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

asked Sep 15, 2022 151k views

15 votes

Rebecca solved

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

6.8k points

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10 votes

No.

$√(45)=3√(5) \\2√(20) =2\sqrt5}$

If you add them up you DO NOT GET
5√(5). According to mathematics, it equals to
7√(5) .

Felixfbecker answered Sep 22, 2022

7.5k points

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