Answer:
B. 2x³ + 14x²
General Formulas and Concepts:
Pre-Algebra
Algebra I
- Terms/Coefficients/Degrees
- Exponential Rule: [tex]\displaystyle b^m \cdot b^n = b^{m + n}[/tex]
Geometry
- Area of a Rectangle: A = lw
Step-by-step explanation:
Step 1: Define
l = 2x²
w = x + 7
Step 2: Find A
- Substitute [AR]: A = 2x²(x + 7)
- Distribute 2x²: A = 2x³ + 14x²
