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 .
9 exam-style questions on Edexcel A Level Old Maths Logs. Each one has a worked solution and a mark scheme showing where the marks go.