Answer:
22 m^2
Explanation:
You have two options:
you can see it as a 4x4 square (on the right) with the attached 2x3 rectangle (totalling 16 + 6 m^2) or, as a 7x4 rectangle (28 total) to which you have removed a 2x3 rectangle (to 28-6 m^2).
Either way you total 22 m^2