Problem 8 of 7
Evaluate f(x)=x^3-2x at x=-1.
Hints
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substitute input and simplify.
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Function rule must be directly evaluable at numeric input.
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Correct
Your answer is equivalent to the expected form.
Solution
Walkthrough
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1. Replace the variable with the input value.
2. Use parentheses for negative inputs.
3. Simplify using order of operations.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Substitution errors, especially with negative or absolute-value inputs.