The length of a rectangle is 11 cm. this is 3 cm more than twice the width

Step-by-step explanation:

take the width as x

2x+3 = 11

2x = 11 -3

2x = 8cm

so x = 4cm

let x represent the width of the border

so th function represents the area, a, to e mulched is

the area to be mulched is the area of the big rectangle with the border minus the area of the original garden

a = ( l + 2x)( w + 2x) – (lw)

a = ( 2w + 3a + 2x) ( w + 2x) – ( 2w^2 + 3w)