Please help me understand the first input. An explanation would be appreciated.

The derivative of a function of f at :1: is given by r i .m f($+h)f($) f (m) i label} h provided the limit exists. Use the denition of the derivative to nd the derivative of f (ac) = 33:2 + 63 + 3. Enter the fully simplied expression for f(:v + h) i f (in). Do not factor. Make sure there is a space between variables. re+mna=l ill f'tm)=l6*x+6 rms is carve, \\' Show your work and explain, in your own words, how you arrived at your answers