Chapter R - Section R.2 - Algebra Essentials - R.2 Assess Your Understanding - Page 28: 106

$3$

Work Step by Step

RECALL: For a positive real number $a$: $\sqrt{a^2}=a$ Substitute $2$ in for $x$ and $1$ in for $y$ to obtain: $=\sqrt{2^2}+\sqrt{1^2}$ Use the rule above to obtain: $=2+1 \\=3$

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