Symmetry about the y-axis
from class: Calculus I Definition A function is symmetric about the y-axis if for every point $(x, y)$ on the graph, the point $(-x, y)$ is also on the graph. This implies that $f(x) = f(-x)$ for all x in the domain of the function.
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Predict what's on your test 5 Must Know Facts For Your Next Test Symmetry about the y-axis means that reflecting the graph over the y-axis does not change its appearance. If a function $f$ is even, then it is symmetric about the y-axis. To test for symmetry about the y-axis algebraically, replace $x$ with $-x$ in the function and check if you get back the original function. Graphs of polynomial functions with only even powers of x (e.g., $f(x) = x^2$, $f(x) = x^4 - 2x^2 + 1$) are symmetric about the y-axis. Y-axis symmetry can simplify integration and finding areas under curves since you can integrate from 0 to a positive value and double the result. Review Questions How can you determine if a function is symmetric about the y-axis by looking at its equation? Why are even functions always symmetric about the y-axis? Give an example of a polynomial function that is symmetric about the y-axis.
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