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22.01.2021 •
Mathematics
1 5.4.3 Test (CST): Exponents and Exponential Functions
Question 15 of 25
Find f(-4) for f(x) = 9(3)*
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Ответ:
f(-4) = ⅑
Step-by-step explanation:
Given
f(x) = 9(3)^x
Required.
Find f(-4)
f(x) = 9(3)^x
Substitute -4 for x
f(-4) = 9(3)^(-4)
Apply laws of indices
f(-4) = 9 * 1/(3⁴)
f(-4) = 9 * (⅓)⁴
f(-4) = 9 * 1/81
f(-4) = 9/81
Simplify
f(-4) = ⅑
Ответ: