Question
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For the plecewise linear function, find \( (a) f(-4),(b) f(-2) \), (c) \( f(0) \), (d) \( f(2) \), and \( (e) f(5) \) \( f(x)=\left\{\begin{array}{ll}2 x & \text { if } x \leq-2 \\ x-2 & \text { if } x>-2\end{array}\right. \) (a) \( f(-4)=\square \) (b) \( f(-2)=\square \) (c) \( f(0)=\square \) (d) \( f(2)=\square \)

Ask by Ross Schwartz. in the United States
Feb 28,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

(a) \( f(-4) = -8 \) (b) \( f(-2) = -4 \) (c) \( f(0) = -2 \) (d) \( f(2) = 0 \)

Solution

We are given the piecewise function   f(x) = { 2x if x ≤ –2       x – 2 if x > –2 } To evaluate: (a) f(–4):  Since –4 ≤ –2, we use f(x) = 2x.  So, f(–4) = 2(–4) = –8. (b) f(–2):  Since –2 is exactly –2 (and –2 ≤ –2), we use f(x) = 2x.  So, f(–2) = 2(–2) = –4. (c) f(0):  Since 0 > –2, we use f(x) = x – 2.  So, f(0) = 0 – 2 = –2. (d) f(2):  Since 2 > –2, we use f(x) = x – 2.  So, f(2) = 2 – 2 = 0. (e) f(5):  Since 5 > –2, we use f(x) = x – 2.  Thus, f(5) = 5 – 2 = 3. Final Answers: (a) f(–4) = –8 (b) f(–2) = –4 (c) f(0) = –2 (d) f(2) = 0 (e) f(5) = 3

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To solve for \( f(x) \) at the given values, we need to determine which piece of the piecewise function to use for each input. For \( (a) f(-4) \): Since \(-4 \leq -2\), we use the first piece: \[ f(-4) = 2(-4) = -8 \] So, \( f(-4) = -8 \). For \( (b) f(-2) \): Here, we still use the first piece since \(-2\) is equal to \(-2\): \[ f(-2) = 2(-2) = -4 \] Thus, \( f(-2) = -4 \). For \( (c) f(0) \): Since \(0 > -2\), we switch to the second piece: \[ f(0) = 0 - 2 = -2 \] Therefore, \( f(0) = -2 \). For \( (d) f(2) \): Again, since \(2 > -2\), we use the second piece: \[ f(2) = 2 - 2 = 0 \] So, \( f(2) = 0 \). Thus, we have summarized the results as: (a) \( f(-4)=-8 \) (b) \( f(-2)=-4 \) (c) \( f(0)=-2 \) (d) \( f(2)=0 \)

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