Question

1_ √80 - 1_√63 - 1_√180 = ?
4 6 9

Answer 1

$\sqrt{80}= \sqrt{16*5}=[tex]4 \sqrt{5} ]$
$\sqrt{63}= \sqrt{9*7} =3 \sqrt{7}$
$\sqrt{180}= \sqrt{9*4*5} =3*2 \sqrt{5} =6 \sqrt{5}$
$4 \sqrt{5} -3 \sqrt{7} -6 \sqrt{5} =-2 \sqrt{5} -3 \sqrt{7}$