Respuesta :

chey2634
Because the left side sqrt is multiplied by 3 if it was just added it would be correct because it would cancel out and leave the 3’s. Since it’s multiplied it would change the value

[tex]\bf 3\sqrt{7}-\sqrt{7}=3\implies 3\sqrt{7}-1\sqrt{7}=3\implies \stackrel{\textit{adding like-terms}}{2\sqrt{7}\ne 3}[/tex]


bear in mind that 3√7, is really 1√7 + 1√7 + 1√7, if we subtract 1√7 from it, we're left with 2√7.

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