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A-level Maths — Integration Masterclass
Jodie McNaught · Senior Edexcel Maths Examiner · 12 years marking
✎ Jodie McNaught’s whiteboard · live annotation
∫(2x + 1) dx
Let u = 2x + 1
du/dx = 2 → dx = du/2
= ∫u · (du/2)
= (1/2)∫u du
= (1/2) · u²/2 + C
⚑ Jodie’s note: the +C is non-negotiable — always write it. 1 mark lost here in almost every script I see.