area of the square:
[tex]\begin{gathered} a=l\times l \\ a=5\times5 \\ a=25 \end{gathered}[/tex]
area of the rectangle
[tex]\begin{gathered} a=b\times h \\ a=3\times2 \\ a=6 \end{gathered}[/tex]
area of the shaded region:
area of the square - area of the rectangle = area of the shaded region
[tex]25-6=19[/tex]
answer: B 19 saquare units
