Composite Functions & Substitution | 3-Mark IGCSE/GCSE Math Tutorial

Mastering functions is essential for higher-tier math papers. In this video, we walk through a multi-part 3-mark question involving substitution and composite functions. Step-by-Step Solutions: Part (a): Finding g(3) through simple substitution. Part (b): Finding gf(x) by putting the entire function f into g and simplifying the resulting algebraic fraction. Exam Tip: For composite functions like gf(x), always work from the "inside out." The function on the right (f) goes inside the function on the left (g)! Hashtags: #MathsRevision #GCSEMaths #IGCSEMaths #Functions #CompositeFunctions #Algebra #ExamPrep #StepByStepMaths #MathTimeWithOmer