Consider the function \( f(x)=x^{2}+3 \) for the domain \( [0, \infty) \). Find \( f^{-1}(x) \), where \( f^{-1} \) is the inverse of \( f \). Also state the domain of \( f^{-1} \) in interval notation. \( f^{-1}(x)=\prod \) for the domain
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To find the inverse function of \( f(x) = x^2 + 3 \), we start by setting \( y = f(x) = x^2 + 3 \). Rearranging this equation gives: \[ x^2 = y - 3 \] Taking the square root of both sides, we have: \[ x = \sqrt{y - 3} \] Since the original function is defined for \( x \geq 0 \), we only consider the positive root. Thus, the inverse function is: \[ f^{-1}(x) = \sqrt{x - 3} \] Now, we determine the domain of \( f^{-1} \). The expression inside the square root must be non-negative, so we have: \[ x - 3 \geq 0 \implies x \geq 3 \] In interval notation, the domain of \( f^{-1} \) is: \[ [3, \infty) \]