Which of the following functions is an even function?
✓ Correct Answer: Option B
An even function satisfies f(-x) = f(x). For f(x) = x² - 5, f(-x) = (-x)² - 5 = x² - 5, which is equal to f(x).
An even function satisfies f(-x) = f(x). For f(x) = x² - 5, f(-x) = (-x)² - 5 = x² - 5, which is equal to f(x).