Question 392090
Let x  = edge of the square photo. Then its area is {{{x^2}}}.
Area of the 4 square corners = 4*2*2 = 16,
Area of the 4 rectangles making up the frame = 4*2*x = 8x.
Then {{{16 + 8x + x^2 = 144}}}.
==>  {{{x^2 + 8x - 128 = 0}}} ==> (x + 16)(x-8) = 0 ==> x = 8.
Therefore the photo 8cm x 8 cm.