Answer:
A. x² - x
General Formulas and Concepts:
Pre-Algebra
Algebra I
- Terms/Coefficients/Degrees
- Expand by FOIL (First Outside Inside Last)
Geometry
- Area of a Rectangle: A = lw
Explanation:
Step 1: Define
l = x
w = x - 1
Step 2: Find A
- Substitute [AR]: A = x(x - 1)
- Distribute x: A = x² - x