1. For each of the following relations, indicate whether it is a function. If it is a function, give its range. If it is not a function, explain why. f:R → R such that f(x) = Vx а. b. f:R → R such that f(x) = Vx²

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
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Chapter2: Functions And Their Graphs
Section2.4: A Library Of Parent Functions
Problem 47E: During a nine-hour snowstorm, it snows at a rate of 1 inch per hour for the first 2 hours, at a rate...
Question
**1.** For each of the following relations, indicate whether it is a **function**. If it is a function, **give its range**. If it is not a function, **explain why**.

   **a.** \( f : \mathbb{R} \rightarrow \mathbb{R} \) such that \( f(x) = \sqrt{x} \)

   **b.** \( f : \mathbb{R} \rightarrow \mathbb{R} \) such that \( f(x) = \sqrt{x^2} \)

*Answer box for 1.*

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**2.** For each of the following functions, indicate whether it is **invertible**. If it is invertible, **give its inverse**. If it is not invertible, **explain why**.

   **a.** \( f : \mathbb{Z} \rightarrow \mathbb{Z} \) such that \( f(x) = x - 2 \)

   **b.** \( f : \mathbb{Z} \rightarrow \mathbb{Z} \) such that \( f(x) = 2x + 1 \)

*Answer box for 2.*

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**3.** Prove that the following function is **not injective (one-to-one)** and **not surjective (onto)**.

   Hint: find a **counterexample**.

   \( f : \mathbb{R} \rightarrow \mathbb{R} \) such that \( f(x) = |x - 1| \)

*Answer box for 3.*
Transcribed Image Text:**1.** For each of the following relations, indicate whether it is a **function**. If it is a function, **give its range**. If it is not a function, **explain why**. **a.** \( f : \mathbb{R} \rightarrow \mathbb{R} \) such that \( f(x) = \sqrt{x} \) **b.** \( f : \mathbb{R} \rightarrow \mathbb{R} \) such that \( f(x) = \sqrt{x^2} \) *Answer box for 1.* --- **2.** For each of the following functions, indicate whether it is **invertible**. If it is invertible, **give its inverse**. If it is not invertible, **explain why**. **a.** \( f : \mathbb{Z} \rightarrow \mathbb{Z} \) such that \( f(x) = x - 2 \) **b.** \( f : \mathbb{Z} \rightarrow \mathbb{Z} \) such that \( f(x) = 2x + 1 \) *Answer box for 2.* --- **3.** Prove that the following function is **not injective (one-to-one)** and **not surjective (onto)**. Hint: find a **counterexample**. \( f : \mathbb{R} \rightarrow \mathbb{R} \) such that \( f(x) = |x - 1| \) *Answer box for 3.*
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