Leaving Cert Maths: Solve Volume Function Roots (2025 DEFF)

Struggling to find the roots of a volume function in your Leaving Cert Maths exam? This step-by-step guide breaks down the 2025 DEFF Paper 1 Question 9 (a) (iv) so you can secure full marks under pressure. We analyze this question through the lens of the SEC Marking Scheme, showing you exactly where to pick up easy attempt marks even if you get stuck. Understanding the relationship between the radius and the total volume is key to mastering these higher-level functions and guaranteeing your H1 or H2. 0:00 - Introduction to Question 9 (a) (iv) 0:12 - Understanding the Cylinder Net & Given Variables 0:45 - Analyzing the Volume Function Graph 1:40 - Explaining Search Intent: Radius vs. Volume 2:35 - The Volume of a Cylinder Formula breakdown 3:25 - Solving for a (Radius is Zero) 4:05 - Solving for b (Height is Zero) 4:30 - Final Answer & Summary #LeavingCertMaths #SECMaths #LeavingCert2026 #MathsGrinds #IrishEducation Leaving Cert Maths, Higher Level Maths Ireland, SEC Maths Paper 1, Volume of a Cylinder, Functions and Graphs, 2025 DEFF Paper 1, Irish Secondary School, Maths School of Grinds, Exam Solutions Ireland, Calculus and Functions, Solving for Roots, SEC Marking Scheme, Maths Revision Ireland, Junior Cycle Maths, Leaving Cert 2026.