Penjelasan dengan langkah-langkah:
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Hanya bilangan yang memiliki akar yang sama yang dapat dikurangi maupun ditambah
20√7 + 2√7 - 11√7
= (20 + 2 - 11)√7
= 11√7
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[tex] \begin{gathered} \boxed{ \boxed {\begin{aligned} \underline{ \blue{ \sf{20 \sqrt{7} + 2 \sqrt{7} - 11 \sqrt{7} }}} \\ \sf{ = (20 + 2) \sqrt{7} - 11 \sqrt{7} } \\ \sf{ = 22 \sqrt{7} - 11 \sqrt{7} } \\ \sf{ = (22 - 11) \sqrt{7} } \\ \sf{ = \underline{ \red{11\sqrt{7} } }}\end{aligned}}} \end{gathered}[/tex]
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