Answer:

length: 8 inches

width: 5 inches

Step-by-step explanation:

dimensions are length and width

let length as x

and width as y

x=3+y

y=y

formula of area of a rectangle is length multiplied by width

the area is 40

40=(3+y)y

40=3y+y²

y²+3y-40=0

(y+8)(y-5)=0

y=-8

y=5

x=3+y

x=3-8

x=-5

x=3+y

x=3+5

x=8

the length must be higher than the width so our length is 8 and our width is 5