For a valid exponential base, [...]\text{[...]}[...] for every real xxx.
A
Exponentiation undoes a logarithm of the same base: \boxed{a^{log_a x}=x}, where x>0x>0x>0.
B
The domain of y=ln x is x>0x>0x>0, while its range is all real numbers.
C
−3-3−3
D
For a valid exponential base, ax>0\boxed{a^x>0}ax>0 for every real xxx.
1.9.3 Logarithms as inverse functions Flashcards
Flashcards for AQA A Level Maths 1.9.3 Logarithms as inverse functions, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 21 cards, matched to the AQA A Level Maths (7357) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.