Question

..2-simplifique as expressoes D)7 raiz de32 ,- 5 raiz de 2 ,+ raiz de 8

Answer 1

$7 \sqrt{32} - 5 \sqrt{2} + \sqrt{8} = \\ \\ 28 \sqrt{2} - 5 \sqrt{2} + 2 \sqrt{2} = \\ \\ 25 \sqrt{2}$

Answer 2

$7\sqrt{32} -5 \sqrt{2} + \sqrt{8}$
$=7 \sqrt{2*4^{2} } -5 \sqrt{2} + \sqrt{2*2^{2} }$
$=7*4 \sqrt{2 } -5 \sqrt{2} + 2\sqrt{2 }$
$=28 \sqrt{2 } -5 \sqrt{2} + 2\sqrt{2 }$
$=(28-5+2) \sqrt{2}$
$=25 \sqrt{2}$