Use the substitution u=x2+5u = x^2 + 5u=x2+5 to find ∫123x(x2+5)2dx\int_1^2 3x(x^2 + 5)^2 dx∫123x(x2+5)2dx.
119 exam-style questions on AQA A Level Maths 1.11.5 Integration by substitution and by parts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.