Is this rectangle also a square? Explain how you can tell

we can tell a rectangle is also a square when both width and length are the same,
then,
[tex]x+1=x+3[/tex]solve for x
[tex]\begin{gathered} x-x=3-1 \\ 0\ne2 \end{gathered}[/tex]there is not solution, then the rectangle shown is not a square