You need to get that binder but the door to the office has an electronic lock which requires a four-letter password. Curiously, posted on the wall next to the door is a sheet of paper with the message: "To enter, find the tangent lines, then follow them to the x-axis. You should always land on an integer between 1 and 26." Immediately below the message you see: x2 - 2x + 17 x2 - 34x + 449 x2- 52x + 580 x2- 32x + 368 at a = -3 at x = 7 at x = 20 at x = 2 What four-letter password do you enter? AQZP