Can someone tell me what’s going on with this pattern changes. and next step pattern that would look like. and a function rule to find how many step are in

The function y= x - 4x+ 5 approximates the height, y, of a bird, and its horizontal distance, x, as it flies from one fence post to another. all distances are in feet. complete the square to find and interpret the extreme value (vertex). select two answers: one extreme value and one interpretation.