a=8a = 8a=8 b=−5b = -5b=−5 c=2c = 2c=2
Work out the value of b2−4acb^2 - 4acb2−4ac
Practise OCR GCSE Maths Substitution with exam-style questions for Foundation and Higher tier. 100 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.