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Terry was asked to determine whether 
f(x)=x^(3)+(1)/(x) is even, odd, or neither. Here is his work:
Step 1: Find expression for 
f(-x)

{:[f(-x)=(-x)^(3)+(1)/((-x))],[=-x^(3)-(1)/(x)]:}
Step 2: Check if 
f(-x) is equal to 
f(x) or 
-f(x)

-x^(3)-(1)/(x) isn't the same as 
f(x)=x^(3)+(1)/(x) or

-f(x)=-x^(3)+(1)/(x)". "
Step 3: Conclusion

f(-x) isn't equivalent to either 
f(x) or 
-f(x), so 
f is neither even nor odd.
Is Terry's work correct? If not, what is the first step where Terry made a mistake?
Choose 1 answer:
(A) Terry's work is correct.
(B) Terry's work is incorrect. He first made a mistake in Step 1.
(C) Terry's work is incorrect. He first made a mistake in Step 2.
(D) Terry's work is incorrect. He first made a mistake in Step 3.

Terry was asked to determine whether f(x)=x3+1x f(x)=x^{3}+\frac{1}{x} is even, odd, or neither. Here is his work:\newlineStep 11: Find expression for f(x) f(-x) \newlinef(x)=(x)3+1(x)=x31x \begin{aligned} f(-x) & =(-x)^{3}+\frac{1}{(-x)} \\ & =-x^{3}-\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) \newlinex31x -x^{3}-\frac{1}{x} isn't the same as f(x)=x3+1x f(x)=x^{3}+\frac{1}{x} or\newlinef(x)=x3+1x -f(x)=-x^{3}+\frac{1}{x} \text {. } \newlineStep 33: Conclusion\newlinef(x) f(-x) isn't equivalent to either f(x) f(x) or f(x) -f(x) , so f f is neither even nor odd.\newlineIs Terry's work correct? If not, what is the first step where Terry made a mistake?\newlineChoose 11 answer:\newline(A) Terry's work is correct.\newline(B) Terry's work is incorrect. He first made a mistake in Step 11.\newline(C) Terry's work is incorrect. He first made a mistake in Step 22.\newline(D) Terry's work is incorrect. He first made a mistake in Step 33.

Full solution

Q. Terry was asked to determine whether f(x)=x3+1x f(x)=x^{3}+\frac{1}{x} is even, odd, or neither. Here is his work:\newlineStep 11: Find expression for f(x) f(-x) \newlinef(x)=(x)3+1(x)=x31x \begin{aligned} f(-x) & =(-x)^{3}+\frac{1}{(-x)} \\ & =-x^{3}-\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) \newlinex31x -x^{3}-\frac{1}{x} isn't the same as f(x)=x3+1x f(x)=x^{3}+\frac{1}{x} or\newlinef(x)=x3+1x -f(x)=-x^{3}+\frac{1}{x} \text {. } \newlineStep 33: Conclusion\newlinef(x) f(-x) isn't equivalent to either f(x) f(x) or f(x) -f(x) , so f f is neither even nor odd.\newlineIs Terry's work correct? If not, what is the first step where Terry made a mistake?\newlineChoose 11 answer:\newline(A) Terry's work is correct.\newline(B) Terry's work is incorrect. He first made a mistake in Step 11.\newline(C) Terry's work is incorrect. He first made a mistake in Step 22.\newline(D) Terry's work is incorrect. He first made a mistake in Step 33.
  1. Find f(x)f(-x): Find the expression for f(x)f(-x).
    f(x)=(x)3+1xf(-x)=(-x)^{3}+\frac{1}{-x}
    This simplifies to x31x-x^{3}-\frac{1}{x}, since (x)3(-x)^{3} is x×x×x-x\times x\times x which is x3-x^{3} and 1x\frac{1}{-x} is 1x-\frac{1}{x}.
  2. Check equality: Check if f(x)f(-x) is equal to f(x)f(x) or f(x)-f(x).f(x)=x3(1)/(x)f(-x)=-x^{3}-(1)/(x) is not the same as f(x)=x3+(1)/(x)f(x)=x^{3}+(1)/(x). Now check if it's equal to f(x)-f(x): f(x)=[x3+(1)/(x)]=x3(1)/(x)-f(x)=-[x^{3}+(1)/(x)]=-x^{3}-(1)/(x). Oops, looks like Terry made a mistake here. f(x)f(-x) is actually the same as f(x)-f(x).

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