Question

a=9-√72
b=3(3+2√2)
Am nevoie de un raspuns urgent!!!

Answer 1

$a=9- \sqrt{72}=9- \sqrt{8*9}=9- \sqrt{ 2^{2}*2* 3^{2} }=9-2*3* \sqrt{2}=9-6*$$\sqrt{2} =9-6\sqrt{2}$
$b=3(3+2 \sqrt{2})=9+2 \sqrt{2}*3=9+6 \sqrt{2}$