Which function represents exponential growth?

Select one:

a. y(x) = 3(2.2)x

b. y(x) = 3x2 + 2x + 1

c. y(x) = 3(.22)x

d. None of the above

Question

Which function represents exponential growth?


Select one:


a. y(x) = 3(2.2)x 

b. y(x) = 3x2 + 2x + 1 

c. y(x) = 3(.22)x 

d. None of the above

anonymous · Answer

@kc_kennylau @TylerD

tylerd · Answer

exponential growth is the form

$$f(x)=ab^x$$

tylerd · Answer

yep

kc_kennylau · Answer

And for it to be growth, b must be larger than one

nincompoop · Answer

NONE of them represent any exponents

anonymous · Answer

lol

anonymous · Answer

so its non of the above

kc_kennylau · Answer

He means that when you copy $\Large e^x$, you just copy the text and it becomes ex, which makes it not an exponent.

kc_kennylau · Answer

To prevent that, you can use the notation e^x to represent $\Large e^x$

kc_kennylau · Answer

But I think most of the people here know that you are referring to $\large e^x$ when you type ex, so @nincompoop please don't be so stubborn.

anonymous · Answer

are you guys done arguing I need help

kc_kennylau · Answer

I think the information given by Tyler and me is sufficient for you to complete the question.

nincompoop · Answer

study and show what you've learned 
please do not expect to be spoon-fed with answers

anonymous · Answer

u mad bro

kc_kennylau · Answer

Firstly the variable (x) should be the index instead of the base, so option B is eliminated.

kc_kennylau · Answer

$$\mbox{base}^\mbox{index}$$

kc_kennylau · Answer

And the base should be larger than 1 for it to be a growth (otherwise it's called a decay), so option C is also eliminated.

kc_kennylau · Answer

Option A matched the two requirements, so it is the correct answer.

anonymous · Answer

thnx man

anonymous · Answer

I really understand it now