Question

7raiz de 2 menos raiz de 8 mais raiz de 32

Answer 1

$7 \sqrt{2} - \sqrt{8} + \sqrt{32} = \\ 7 \sqrt{2} - \sqrt{ {2}^{2} + 2} + \sqrt{ {2}^{2} + {2}^{2} + 2} \\ 7 \sqrt{2} - 2 \sqrt{2} + 4 \sqrt{2} \\ 9 \sqrt{2}$