Question 1100194
Find the Exponential function f(x)=a^x whos grpah is given. 
Graph points are (-2,4)

I did f(-2)=4
a^-2 =4
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1/a^2 = 4
a^2 = 1/4
a = 1/2
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a^2=-4
and im stuck because now im getting a root of a negative, which this is not about imaginary numbers.