anonymous
  • anonymous
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
Mathematics
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anonymous
  • anonymous
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
Mathematics
jamiebookeater
  • jamiebookeater
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mathstudent55
  • mathstudent55
Test the point in each equation and see which one works.
anonymous
  • anonymous
How? could you explain please
mathstudent55
  • mathstudent55
Also, an exponential function has the form \(\large f(x) = ab^x\) This alone will allow you to eliminate two answers.

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mathstudent55
  • mathstudent55
An exponential function has x as an exponent. What can you conclude about the first two choices?
anonymous
  • anonymous
A and B cannot be correct
mathstudent55
  • mathstudent55
Good. Now let's look at C and D.
anonymous
  • anonymous
Okay..
mathstudent55
  • mathstudent55
Choice C Is this true? \(80 = 4 \cdot 5^2\) Choice D Or is this true? \(80 = 5 \cdot 4^2\)
anonymous
  • anonymous
D
anonymous
  • anonymous
16x5=80
anonymous
  • anonymous
Thank you
mathstudent55
  • mathstudent55
Correct.

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