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The problem

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is this exponential growth or decay?

Answer provided by our tutors

An exponential function is a function whose variable is in the exponent. The general form is y=a \cdot b^{x-h}+k.

An exponential growth function is a specific type of exponential function that has the form y=ab^x, where h=k=0, a>0, and b>1.

An exponential decay function is a specific type of exponential function that has the form y=ab^x, where h=k=0, a>0 and 0<b<1.

In your case the function is y = -1(3^x) and this is not an exponential growth function nor exponential decay function. 

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