The function f(x) = −x2 − 4x + 5 shows the relationship between the vertical distance of a diver from a pool's surface f(x), in feet, and the horizontal distance x, in feet, of a diver from the diving board. what is a zero of f(x), and what does it represent? x = 1; the diver hits the water 1 foot away horizontally from the board x = 1; the diver jumps in the pool at 1 foot per second x = 5; the diver hits the water 5 feet horizontally from the board x = 5; the diver jumps in the pool at 5 feet per second