Learn how to solve this 4th-degree polynomial equation with substitution. We will solve (x^2+6x+1)(x^2+6x-3)=5, and of course, we shouldn't expand it right away. So, watch and see how to use a clever substitution to help us solve that equation! ----------------------------- 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 👉 Get your "algebra" t-shirt 👉 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