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Which of the following statements is true about the exponential function ℎ given by ℎ𝑥=-3·4𝑥 ?Responsesℎ is always increasing, and the graph of ℎ is always concave up.h  is always increasing, and the graph of  h  is always concave up.ℎ is always increasing, and the graph of ℎ is always concave down.h  is always increasing, and the graph of  h  is always concave down.ℎ is always decreasing, and the graph of ℎ is always concave up.h  is always decreasing, and the graph of  h  is always concave up.ℎ is always decreasing, and the graph of ℎ is always concave down.

Question

Which of the following statements is true about the exponential function ℎ given by ℎ𝑥=-3·4𝑥 ?Responsesℎ is always increasing, and the graph of ℎ is always concave up.h  is always increasing, and the graph of  h  is always concave up.ℎ is always increasing, and the graph of ℎ is always concave down.h  is always increasing, and the graph of  h  is always concave down.ℎ is always decreasing, and the graph of ℎ is always concave up.h  is always decreasing, and the graph of  h  is always concave up.ℎ is always decreasing, and the graph of ℎ is always concave down.

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Solution

The function ℎ is always decreasing, and the graph of ℎ is always concave down. This is because the base of the exponential function (4) is greater than 1, but the function is multiplied by -3, which makes it a decreasing function. The graph of a decreasing exponential function is always concave down.

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