Question

raiz de 12-9 raiz de 3+ raiz de 75

Answer 1

$\sqrt{12}$ - 9 $\sqrt{3}$+  $\sqrt{75}$

12 = 4 x 3    ==>    $\sqrt{12}$ = 2 $\sqrt{3}$
75 = 25 x 3  ==>    $\sqrt{75}$ = 5 $\sqrt{3}$

então :  2 $\sqrt{3}$ - 9 $\sqrt{3}$ +   5 $\sqrt{3}$ =

             - 2 $\sqrt{3}$