Proving 7^n-4^n is a multiple of 3 by mathematical induction

This math tutorial covers the steps of proving 7^n-4^n is a multiple of 3 for all positive integers n by using mathematical induction. This is a common induction proof problem, but it can be a bit tricky if you haven't seen the key step before. ----------------------------- I help students master the basics of math. You can show your support and help me create even better content by becoming a patron on Patreon 👉 https://www.patreon.com/blackpenredpen. Get your "algebra" t-shirt 👉 https://amzn.to/3A8Ed4k Every bit of support means the world to me and motivates me to keep bringing you the best math lessons! Thank you! ----------------------------- #math #algebra #mathtutorials #alevelmaths