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OpenStudy (anonymous):
simplify 5√45 + 3√20
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OpenStudy (anonymous):
\[5 \sqrt{45} + 3 \sqrt{20} =5 \sqrt{3 \times 3 \times 5} + 3 \sqrt{2 \times 2 \times 5} \] \[=5 \times 3 \sqrt{ 5} + 3 \times 2 \sqrt{ 5} =15 \sqrt{ 5} + 6 \sqrt{ 5} =21 \sqrt{ 5}\]
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