Question

Which function represents exponential growth?
a)f(x)= (0.5)^x
b)f(x)= -12^x
c)f(x)= 18(2/3)^x
d)f(x)= 20^x

Answer 1

for A and C,
x→∞ f(x)→0

For B
x→∞ odd f(x)→ -∞
x→∞ even f(x)→ ∞

For D
x→∞ f(x)→ ∞

Answer 2

This is not an answer. Just look at the graphs and the functions. @SolomonZelmen is absolutely right, but I can see how that may be confusing.

Answer 3

@SolomonZelman I'm sure B is \(-12^x =-(12)^x\) and not \((-12)^x\)
So that would be:
x→∞ f(x)→-∞

Answer 4

@ludvic
You want a "exponential growth" function, which mean f(x) getting bigger as x getting bigger

in other word, f(x) grows exponentially as x grows.

so do you know the answer?

Answer 5

no

Answer 6

@geerky42