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Q. |
A function f(x) is even, when? |
A. | f(x) = -f(x) |
B. | f(x) = f(-x) |
C. | f(x) = -f(x)f(-x) |
D. | f(x) = f(x)f(-x) |
Answer» B. f(x) = f(-x) | |
Explanation: geometrically a function f(x) is even, if plot of the function is symmetric over y-axis. algebraically, for any function f(x) to be even, f(x) = f(-x). |
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