Algebra II lesson on ellipses, demonstrating how to write the equation of an ellipse in standard form with a center at (0,0), an endpoint at (5,0), and a focus distance of 4. Includes a diagram, calculations, and the final equation x²/25 + y²/9 = 1.

A math lesson slide on conic sections focusing on ellipses, showing the equation of an ellipse in standard form, a diagram of an ellipse with labeled points, and calculations for finding the equation given the center, endpoint of the major axis, and distance to the focus. The image includes text "Algebra II," "Conic Sections," "Ellipses," "Unit 11: Conic Sections - Lesson 3," and "Mandy's Math World," along with a photo of a woman in the bottom right corner.