Objects in image: Whiteboard
Text visible in image: f(x), =x2+5, =, 2, y=, f(x), Y=x2+5, x=y+5, 2, switch, x=y2+5, XEY, splve, y2+5, =, for, y, y2=x-5, vyz, VX-5, Y=1X-5, =f0)
Question: what number is above f?
Answers: -1, -1, -1, -1, -1, 1, -1, 5, unanswerable, -1