$f: \mathbb{R} \to \mathbb{R}$ and $g: [0, \infty) \to \mathbb{R}$ are defined by $f(x) = x^2$ and $g(x) = \sqrt{x}$. Which one of the following is not true?

Question

$g \circ f(4) = 4$

$f \circ g(-4) = 4$

$f \circ g(2) = 2$

$g \circ f(-2) = 2$

Solution

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