Question

Which of the following functions results in a graph that shows exponential decay? f(x) = 4(0.8)x f(x) = 0.7(1.2)x f(x) = 12(3)x f(x) = 0.5(2)x

Answer 1

1st option on edgu

Explanation:

you can tell it is because of the negative 2

Answer 2

The function will show exponential decay if one of the following is true

• the base is less than 1 and the exponent is positive
• the base is greater than 1 and the exponent is negative

The function that meets the requirement for exponential decay is ...

`f(x)=4\cdot 0.8^(x)\quad\text{matches the first choice}`