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What feature makes y=axy=a^xy=ax an exponential function?
A
The variable xxx appears in the exponent.
B
The variable is the base, not the exponent.
C
As x→−∞x\to-\inftyx→−∞, ex→0\boxed{e^x\to0}ex→0, so the horizontal asymptote is y=0y=0y=0.
D
Reflection in the xxx-axis.
Card 1 of 29
1.5.2 Exponentials and logarithms Flashcards
29 flashcards on CCEA A Level Maths 1.5.2 Exponentials and logarithms: the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.