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kinkin79
23.07.2020 •
Mathematics
What is the value of xx) = 9^x when x= -2?
A. 1/81
B. 81
C. 1/81
D. 18
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Ответ:
C.![9^{-2} = \frac{1}{81}](/tpl/images/0711/4814/9fa05.png)
Step-by-step explanation:
Given
Required
Find the expression where x - 2
Substitute 2 for x
From law of indices which states
So, the expression becomes
Expand the denominator
Hence,
is
when x = 2
Ответ:
what do u need help with
Step-by-step explanation: