Relations and Functions
RS Aggarwal
CBSE
Grade 12
Question:
Consider $f: \mathbb{R}_+ \to [4, \infty)$ given by $f(x) = x^2 + 4$. Show $f$ is invertible and find $f^{-1}$.
Step-by-Step Solution
Key Concept: One-one & onto => f^{-1}(y) = \sqrt{y - 4}.
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Correct Answer:
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