In this case, we'll have to carry out several steps to find the solution.
Step 01:
data:
(x + 10)² = 256
Step 02:
original dimensions:
equation:
x = side measure (original photo)
[tex]\begin{gathered} (x\text{ + 10\rparen}^2\text{ = 256 } \\ \\ \sqrt{(x+10)\placeholder{⬚}^2}=\sqrt{256} \\ \\ x+10=16 \\ \\ x\text{ = 16 - 10} \\ \\ x\text{ = 6} \end{gathered}[/tex]
The answer is:
6 inches by 6 inches
