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The function g(x)=8(4x) is reflected across the x-axis to create f(x).

On a coordinate plane, 2 exponential functions are shown. Function f (x) approaches y = 0 in quadrant 3 and decreases into quadrant 4. It crosses the y-axis at (0, negative 8). Function g (x) approaches y = 0 in quadrant 2 and increases into quadrant 1. It crosses the y-axis at (0, 8).

What is the equation of f(x)?

f(x)=8(4)x
f(x)=−8(4)x
f(x)=8
f(x)=−8