How to color math symbols?
I have an equation: y = 2x + 3. How would I make the 2x red in equation mode in beamer?
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
if you look into the documentation of the graphicx package (http://ctan.org/pkg/graphicx), you can also define your own colors.