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Question 13 of 25
Find f(-2) for f(x) = 2(4)^x

Question 13 of 25 Find f(-2) for f(x) = 2(4)^x-example-1

2 Answers

7 votes

Answer:

the answer is A

Explanation:

put it in the calculator

9 votes

Answer:


(1)/(8)

Explanation:

When you have a negative exponent like
((a)/(b))^(-x) you simply take the reciprocal and then the denominator takes the exponent. So it becomes
(b)/(a^(x)).

So now you simply plug -2 as x. This gives you
2(4)^(-2). and 4 is essentially
(4)/(1). So it becomes
(1)/(4^2) which is
(1)/(16). So multiplying it by 2 you get
(2)/(16). Which can be written as
(2)/(8 * 2) so the 2's cancel out and the fraction becomes
(1)/(8)

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