Answer:
D. 15x² + 62x + 63
Step-by-step explanation:
rectangle area: length * width
Here the length is ( 3x + 7 ) and width is (5x+9)
using the formula:
( 3x + 7 )(5x+9)
15x²+27x+35x+63
15x² + 62x + 63
D. 15x^2 + 62x +63
Area of rectangle = L x W
L = 3x + 7 ; W = 5x + 9
=> A = (3x + 7) x (5x +9) = 15x^2 + 62x +63
