White board which shows equations in cluding one which has the answer of fx.
Math equations on a whiteboard include f(x) equals x squared plus five.
A long math equation starts with f(x) = x2 + 5
A math problem for solving f(x) = x^2 + 5 on a whiteboard.
A white board has a math problem on it looking for the function which is noted by f(x).