My work for your question
Answer:
a square backyard with width (x - 9)
Step-by-step explanation:
x²−18x + 81 = x² - (2 x 9) x + 9² = (x - 9)²
width = area / length = (x - 9)² / (x - 9) = x - 9
Length = width
This is a square backyard
If you are asking for an equation for this statement, it would be y = x + 5
I believe the SSS theorem as they both share/have side measurements (and no defined angles)
