Edexcel IGCSEMathematicsGeneral Applications3 Marks
Solve 2x² – 5x – 3 = 0. Show your working clearly. Give your answers correct to 3 significant figures.
Mark scheme
Marking points from the official mark scheme. The mark or mark type is shown in brackets.
- M1 for correct substitution into quadratic formula or for factorising (2x ± a)(x ± b) such that ab = ±3
- M1 for x = (5 ± √(25 – 4(2)(-3))) / (2(2)) or (5 ± √49) / 4
- A1 for x = 3, x = –0.5
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