A Level · Maths · Edexcel · Pure Year 1
Chapter 3 · Differentiation

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Question 1 · Differentiation2 marks
Find dy/dx for y = 3x² + 2x − 5
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Question 1 · Differentiation2 marks
Find dy/dx for y = 3x² + 2x − 5
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2/2 full marks
✓Power rule applied correctly to 3x² → 6x and 2x → 2
✓Constant handled right – −5 disappears. Most students lose a mark here.
A

Axi: Full marks, clean work. Want a harder one? The next question adds a fractional power – same rule, one extra trap.

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Question 5 · Quadratics3 marks
Solve 2x² − 5x − 3 = 0
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✓Correct factorisation: (2x + 1)(x − 3)
✓Both roots found, exact form kept – x = 3 and x = −½
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