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Here we have two pretty simple exponential functions. Two to the power of X and three to the power of X.
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Two to the power of zero is one; three to the power of zero is one; two to the power of one is two.
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Two to the power of two is four. Two to the power of minus one equals one over two, one half, and so on.
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Three to the power of one equals three. Three to the power of two gets pretty big--nine.
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Three to the power of minus one, one over three, one-third, and so on, and so on.
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Here comes a quiz for you: What's the slope of the tangent line at X equals zero?
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Is the slope larger than one? Is it equal to one, or is it smaller than one?
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In both cases, look at the tangent lines--what would you say?