Question 1176999
Draw this
The frame has to be 10 x 10 inches or 100 in^2
the photo is 16 in ^2, so the frame area is 84 in^2
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For 5 x 5 it would be 121-25 or 96 in^2
for 3 x 3 it would be 81-9 or 72 in^2
the general form is (x+6)-x^2 or x^2+12x+36-x^2 or 12x+36 for the area of the frame with picture x by x. That checks for the three possibilities above.

12x+36