Can someone help with number 3

Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts. write an equation for sadie’s way of calculating the

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Can someone me and do the problem plz so i can understand it more better