Ill mark you as brainliest.....

yes, it is 26 square units.

Step-by-step explanation:

That shape is just splitted into other shapes, the two small squares fit in that big square.

Hence total area is ( 9+17 ) sq units = 26 sq units

reflections:

1) about the y-axis

2) about the line y = 1

Step-by-step explanation:

CD = AD = sqrt(17) = GH = HE

AB = BC = sqrt(5) = EF = FG

So, ABCD & EFGH are congruent rectangles

This is a combination of 2 reflections:

1) about the y-axis

2) about the line y = 1