a=8a = 8a=8 b=−5b = -5b=−5 c=kc = kc=k
Work out the value of b2−4acb^2 - 4acb2−4ac in terms of kkk
296 exam-style questions on AQA GCSE Maths Substitution. Each one has a worked solution and a mark scheme showing where the marks go.