The length of a rectangle is given by l=3y + 4x while the width is
w- 7y + 2x? . use the box method and write and expression in
standard form that represents the area of this rectangle.

21y² +34 yx + 8x²

Step-by-step explanation:

Area of a rectangle is given by L×W where L is length, and W is width

Given L=3y+4x

          W=7y+2x

Area= (3y+4x) × (7y+2x)

          3y(7y+2x) + 4x(7y+2x)

           21y² + 6yx +28yx+8x²

            21y² +34 yx + 8x²

x> 6

step-by-step explanation:

8x+8> 7x+14

8x-7x> 14-8

x> 6