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Ron was asked to determine whether 
f(x)=(1)/(|x|) is even, odd, or neither. Here is his work:
Step 1: Find expression for 
f(-x)

{:[f(-x)=(1)/(|(-x)|)],[=(1)/(|x|)]:}
Step 2: Check if 
f(-x) is equal to 
f(x) or 
-f(x)

(1)/(|x|) is the same as 
f(x)=(1)/(|x|).
Step 3: Conclusion

f(-x) is equivalent to 
f(x), so 
f is odd.
Is Ron's work correct? If not, what is the first step where Ron made a mistake?
Choose 1 answer:
(A) Ron's work is correct.
(B) Ron's work is incorrect. He first made a mistake in Step 1.
(C) Ron's work is incorrect. He first made a mistake in Step 2.
(D) Ron's work is incorrect. He first made a mistake in Step 3.

Ron was asked to determine whether f(x)=1x f(x)=\frac{1}{|x|} is even, odd, or neither. Here is his work:\newlineStep 11: Find expression for f(x) f(-x) \newlinef(x)=1(x)=1x \begin{aligned} f(-x) & =\frac{1}{|(-x)|} \\ & =\frac{1}{|x|} \end{aligned} \newlineStep 22: Check if f(x) f(-x) is equal to f(x) f(x) or f(x) -f(x) \newline1x \frac{1}{|x|} is the same as f(x)=1x f(x)=\frac{1}{|x|} .\newlineStep 33: Conclusion\newlinef(x) f(-x) is equivalent to f(x) f(x) , so f f is odd.\newlineIs Ron's work correct? If not, what is the first step where Ron made a mistake?\newlineChoose 11 answer:\newline(A) Ron's work is correct.\newline(B) Ron's work is incorrect. He first made a mistake in Step 11.\newline(C) Ron's work is incorrect. He first made a mistake in Step 22.\newline(D) Ron's work is incorrect. He first made a mistake in Step 33.

Full solution

Q. Ron was asked to determine whether f(x)=1x f(x)=\frac{1}{|x|} is even, odd, or neither. Here is his work:\newlineStep 11: Find expression for f(x) f(-x) \newlinef(x)=1(x)=1x \begin{aligned} f(-x) & =\frac{1}{|(-x)|} \\ & =\frac{1}{|x|} \end{aligned} \newlineStep 22: Check if f(x) f(-x) is equal to f(x) f(x) or f(x) -f(x) \newline1x \frac{1}{|x|} is the same as f(x)=1x f(x)=\frac{1}{|x|} .\newlineStep 33: Conclusion\newlinef(x) f(-x) is equivalent to f(x) f(x) , so f f is odd.\newlineIs Ron's work correct? If not, what is the first step where Ron made a mistake?\newlineChoose 11 answer:\newline(A) Ron's work is correct.\newline(B) Ron's work is incorrect. He first made a mistake in Step 11.\newline(C) Ron's work is incorrect. He first made a mistake in Step 22.\newline(D) Ron's work is incorrect. He first made a mistake in Step 33.
  1. Find f(x)f(-x): Find expression for f(x)f(-x)f(x)=1xf(-x) = \frac{1}{\left| -x \right|}Since x=x\left| -x \right| = \left| x \right|, we have f(x)=1xf(-x) = \frac{1}{\left| x \right|}
  2. Check equality of f(x)f(-x): Check if f(x)f(-x) is equal to f(x)f(x) or f(x)-f(x) Since f(x)=1xf(-x) = \frac{1}{|x|} and f(x)=1xf(x) = \frac{1}{|x|}, f(x)f(-x) is equal to f(x)f(x)
  3. Conclusion: Conclusion\newlineRon concluded that since f(x)f(-x) is equivalent to f(x)f(x), ff is odd. However, this is incorrect because if f(x)=f(x)f(-x) = f(x), the function is even, not odd.

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