Respuesta:
[tex]34\sqrt{2}[/tex]
Explicación paso a paso:
[tex]21\sqrt{8}+(-4\sqrt{8})\\ 21\sqrt{8}-4\sqrt{8}=17\sqrt{8\\\\17\sqrt[]{4}\sqrt[]{2} \\17.2\sqrt[]{2}= 34\sqrt[]{2\\}[/tex]
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Respuesta:
[tex]34\sqrt{2}[/tex]
Explicación paso a paso:
[tex]21\sqrt{8}+(-4\sqrt{8})\\ 21\sqrt{8}-4\sqrt{8}=17\sqrt{8\\\\17\sqrt[]{4}\sqrt[]{2} \\17.2\sqrt[]{2}= 34\sqrt[]{2\\}[/tex]