SOLUTION: Hi, Can you help me with this math problem? 13.) Find the function value. Let f(x) =5x.Find f(-2) The answer should be 1 over 25

Question 135651: Hi,
Can you help me with this math problem?
13.) Find the function value.
Let f(x) =5x.Find f(-2)
The answer should be 1 over 25
Found 2 solutions by stanbon, solver91311:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Let f(x) =5^x.
Find f(-2)
--------------
f(-2) = 5^(-2)
The negative means "inverse".
The 2 means "square".
You may carry these two operations in any order.
--------------------
f(-2) = (1/5)2 = 1/25
OR
f(-2) = 25^-1 = 1/25
======================
Cheers,
Stan H.

Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Only if the function is acutually .

If the function is , then ,

But if , then

Remember the rules for exponents: , so:

Hint: When indicating something should be raised to a power, use the caret mark "^" (shift-6). x^2 is x squared, 5^x is 5 to the x power.
RELATED QUESTIONS
Hi, Can you help me with this math problem? 16.) Find the inverse of the... (answered by stanbon)
Hi, Can you help me with this math problem? Find all of the real and imaginary... (answered by ankor@dixie-net.com)
Hi, Can you help me with this math problem? 18.) Find the value of the... (answered by stanbon)
Hi, Can you help me with this math problem? Use synthetic division to find the... (answered by stanbon)
Hi can you help me with this math problem? Find the indicated composite for the pair... (answered by jim_thompson5910)
Hi, Can you help me with this math problem? For the given function, find all... (answered by solver91311)
Please help me with this problem: Let f be the function defined by f(x)=5^{{{(sqrt(... (answered by stanbon)
Hi can you help me with this math problem? Graph the function 7.)... (answered by checkley77)
Tutor can you help me with this math problem?* Thanks Given f(x)=1-5x and g(x)=x^2-3... (answered by jim_thompson5910)