## Algebra 1: Common Core (15th Edition)

a. $-\sqrt 2$ b. $7\sqrt 5$
a. We can simplify the expressions as follows: = $7\sqrt 2 - 8\sqrt 2$ = $7\sqrt 2 - 8\sqrt 2$ (Factoring out $\sqrt 2$) = $\sqrt 2 (7-8)$ = $\sqrt 2 *(-1)$ = $-\sqrt 2$ b. We can simplify the expressions as follows: = $5\sqrt 5 + 2\sqrt 5$ = $\sqrt 5 * (5 + 2)$ = $7\sqrt 5$.