book Maths Puzzle Numerical Ability

Factor: 25x^2-1

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a bicyclist rode into the country for 5 h in returning her speed was 5 mi/h faster and the trip took 4h what was her speed each way? a^2m * b^m+1 over a^m *b i need to simplify this. i know a^2m simlifies to a^m but i dont know what b^m+1 over b would simlify to?