help please
Identify the property that justifies each step asked about in the answer area below.
\text{Line 1: }\phantom{=}
Line 1: =
\,\,(3+x)x
(3+x)x
\text{Line 2: }\phantom{=}
Line 2: =
\,\,x(3+x)
x(3+x)
\text{Line 3: }\phantom{=}
Line 3: =
\,\,x(x+3)
x(x+3)
