Explain how the base 'b' affects the behavior of an exponential function.
If b > 1, the function represents exponential growth, increasing rapidly. If 0 < b < 1, the function represents exponential decay, decreasing rapidly.
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Explain how the base 'b' affects the behavior of an exponential function.
If b > 1, the function represents exponential growth, increasing rapidly. If 0 < b < 1, the function represents exponential decay, decreasing rapidly.
Describe the impact of a vertical shift on an exponential function's graph.
A vertical shift moves the entire graph up or down. Adding a constant 'k' shifts the graph up if k > 0 and down if k < 0.
Explain the concept of limits in the context of exponential functions.
Limits describe the behavior of the function as x approaches infinity or negative infinity. Growth functions tend to infinity, while decay functions tend to zero as x approaches infinity.
Why do exponential functions not have inflection points?
Exponential functions are always either concave up (growth) or concave down (decay), so their concavity never changes, meaning no inflection points.
Explain why exponential functions do not have extrema on open intervals.
Exponential functions are always increasing or always decreasing; therefore, they do not have maximum or minimum values on an open interval.
How do exponential functions model real-world phenomena?
Exponential functions are used to model situations with rapid growth or decay, such as population growth, compound interest, and radioactive decay.
Describe the relationship between the base and the rate of growth/decay.
The larger the base (b > 1), the faster the growth. The smaller the base (0 < b < 1), the faster the decay.
Explain the significance of the y-intercept in an exponential function.
The y-intercept represents the initial value of the function when x = 0. It is the point where the function starts its growth or decay.
How does the domain of an exponential function influence its behavior?
Since the domain is all real numbers, the function is defined for all values of x, allowing it to model continuous growth or decay over time.
Explain the concept of concavity for exponential decay functions.
Exponential decay functions are concave up. This means that the rate of decay decreases as x increases, but the function never changes direction.
What are the differences between exponential growth and exponential decay?
Growth: b > 1, function increases | Decay: 0 < b < 1, function decreases.
What are the differences between vertical shifts and horizontal shifts in exponential functions?
Vertical Shifts: Affect the y-values, change the horizontal asymptote | Horizontal Shifts: Affect the x-values, do not change the horizontal asymptote.
What are the differences between exponential and linear functions?
Exponential: Variable in the exponent, constant percentage change | Linear: Variable in the base, constant additive change.
What are the differences between growth rate and decay rate?
Growth Rate: Positive value, increases the function value | Decay Rate: Negative value (expressed in base), decreases the function value.
What are the differences between concavity of exponential growth and decay functions?
Both exponential growth and decay functions are concave up. However, growth increases rapidly, while decay decreases rapidly but remains above the x-axis.
What are the differences between the limits of exponential growth and decay as x approaches infinity?
Growth: limx→∞f(x)=∞ | Decay: limx→∞f(x)=0
What are the differences between modeling population growth and radioactive decay?
Population Growth: Uses a positive growth rate, increases over time | Radioactive Decay: Uses a negative decay rate, decreases over time.
What are the differences between the domain and range of exponential functions?
Domain: All real numbers | Range: (0,∞) for basic exponential functions without vertical shifts.
What are the differences between simple interest and compound interest?
Simple Interest: Interest calculated only on the principal amount | Compound Interest: Interest calculated on the principal and accumulated interest.
What are the differences between the graphs of y=2x and y=(1/2)x?