I need help in this don’t understand

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat