a=8a = 8a=8 b=−5b = -5b=−5 c=2c = 2c=2
Work out the value of b2−4acb^2 - 4acb2−4ac
Practise Oxford AQA IGCSE Maths Substitution with exam-style questions for Core and Extended tier. 27 questions, matched to the Oxford AQA IGCSE Maths (9260) specification and written in Paper 1 and Paper 2 (Core: 1C and 2C; Extension: 1E and 2E) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.