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 CCEA A Level Maths 3.6.4 Integration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.