Finding the Range of Graphs: f(x) = ex2 and g(x) = x2 + 3ex2

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SUMMARY

The discussion focuses on finding the range of the functions f(x) = e^(x^2) and g(x) = x^2 + 3e^(x^2). The user initially attempted to differentiate f(x) to find its minimum point, resulting in dy/dx = 2xe^(x^2), which indicates a minimum at x = 0. However, the correct conclusion is that the range of f(x) is f(x) ≥ 1, achieved by substituting the x-value back into the original equation. The user clarifies that the minimum point method alone does not yield the complete range without evaluating the function at that point.

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Homework Statement


f(x) = ex2
find the range of f(x)
How do I do this - I don't know how to draw this graph?g(x) = x2 + 3ex2
Again, how is this done without drawing the graph?

Homework Equations


The Attempt at a Solution


so for the first graph, for example, I differentiated it
dy/dx for f(x) = 2xex2
Giving a min. point of 0
BUT THE ANSWER IS f(x) ≥1
Why does the min point method not work?
 
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oh of course, I found the x-value that gives the min. point
so I sub this into the original equation
never mind :)
 

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