suppose the expression x^2+7x+12/(x+2)^2 represents the area of a rectangle
find the expression for the perimeter of the rectangle
Unless it's something really really stupid like you're expected to say
and then you're meant to take as the length and as the width.
Which is why I asked what x was.
In which case all I can say is and hope that whoever set the question accidently sets their pants on fire.