Consider the function f(x)=2x.a) Write the equation for the function g(x) obtained by shifting f(x) three units to the up.b) Determine the domain and range of g(x).c) Now, consider h(x)=−2x. Describe the transformation applied to f(x) to obtain h(x).d) Sketch the graphs of f(x), g(x), and h(x) on the same set of axes.
Question
Consider the function f(x)=2x.a) Write the equation for the function g(x) obtained by shifting f(x) three units to the up.b) Determine the domain and range of g(x).c) Now, consider h(x)=−2x. Describe the transformation applied to f(x) to obtain h(x).d) Sketch the graphs of f(x), g(x), and h(x) on the same set of axes.
Solution
a) The function g(x) obtained by shifting f(x) three units up is g(x) = 2x + 3. This is because adding a constant to a function shifts the graph of the function vertically.
b) The domain of g(x) is all real numbers, because you can substitute any real number for x and the function will still be defined. The range of g(x) is also all real numbers, because the function can take any real value for any real x.
c) The transformation applied to f(x) to obtain h(x) is a reflection in the x-axis. This is because the coefficient of x in h(x) is -2, which is the negative of the coefficient of x in f(x).
d) To sketch the graphs of f(x), g(x), and h(x), start by sketching f(x) = 2x, which is a straight line passing through the origin with a slope of 2. Then, sketch g(x) = 2x + 3, which is the same line shifted three units up. Finally, sketch h(x) = -2x, which is the reflection of f(x) in the x-axis.
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