Solve
5x=85^x = 85x=8 , giving your answer to 3 significant figures,
log2(x+1)−log2x=log27\log_2(x + 1) - \log_2 x = \log_2 7log2(x+1)−log2x=log27 .
Practise Edexcel A Level Old Maths Logs with exam-style questions for A Level Old Maths. 16 questions, matched to the Edexcel A Level Old Maths (9371) specification and written in Unit exams C1, C2, C3 and C4 plus two applied units (e.g. S1 and M1) 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.