Hi

x          -1       0       1  

f(x)       1/8      1/2     2

f(x) = ka^x        |Using ordered pair (0,1/2)

1/2 = k a^0

1/2 = k

f(x) = (1/2)a^x    |using ordered pair (1,2)

 2 = (1/2)a^1

 4 = a 

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