Will I get a whole load of moderators moaning at me?
Yes. Not just moderators, but the whole spectrum of site members (as Kyle Kanos mentioned in a comment). And it's not just moaning; questions which include pictures of something that could be typed out attract downvotes and close votes. They look unprofessional, and (as Qmechanic mentioned in a comment) they are not searchable and are susceptible to link rot or invisible edits.
Sometimes someone will help you out by transcribing the contents of the image. It's not guaranteed, though.
If a new poster does this because they don't know MathJax syntax (or because they don't know how much we hate pictures of text), that's more forgivable, but afterwards we expect you to learn. The basics of MathJax are not hard, and there's a guide built into the posting box. Someone who makes a habit of posting pictures of text or math is going to find their posts getting a poor reception, and could even wind up getting blocked from the site for excessively low-quality contributions.