Alaina was asked whether the following equation is an identity: ( 2 x + 1 ) 2 − ( x + 1 ) 2 = 3 ( x + 1 ) 2 − 1 (2x+1) 2 −(x+1) 2 =3(x+1) 2 −1

Is there a picture of a graph or whatever that goes along with this?

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's