# Chapter 8 - Section 8.3 - Operations with Radicals - Exercise Set - Page 591: 15

$2\sqrt{5}$

#### Work Step by Step

RECALL: For any real numbers $a, b,$ and $c$, $ac+bc=(a+b)c$ Use the rule above to combine like terms: $=(1+1)\sqrt{5} \\=2\sqrt{5}$

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