Question

Need Help please, Medal + Fan:

Which equation represents an exponential function that passes through the point (2, 80)?

f(x) = 4(x)5
f(x) = 5(x)4
f(x) = 4(5)x
f(x) = 5(4)x

Answer 1

Test the point in each equation and see which one works.

Answer 2

How? could you explain please

Answer 3

Also, an exponential function has the form

\(\large f(x) = ab^x\)

This alone will allow you to eliminate two answers.

Answer 4

An exponential function has x as an exponent.
What can you conclude about the first two choices?

Answer 5

A and B cannot be correct

Answer 6

Good.
Now let's look at C and D.

Answer 7

Okay..

Answer 8

Choice C
Is this true?
\(80 = 4 \cdot 5^2\)

Choice D
Or is this true?
\(80 = 5 \cdot 4^2\)

Answer 9

D

Answer 10

16x5=80

Answer 11

Thank you

Answer 12

Correct.