Someone explain to me why did i get plus when i still wouldn't get my questions answered either way. Lol come on someone whos good at algebra please write back and say your willing to help me

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.