Question

упростить СРОЧНО
$\sqrt{ 9 { x }^{ 2 } +6xy+ { y }^{ 2 } \phantom{\tiny{!}}}$

Answer 1

$\sqrt{9x^{2} +6xy+y^{2} } =\sqrt{(3x)^{2}+6xy+y^{2}} =\sqrt{(3x+y)^{2} }=$Ι3x+yΙ