Advanced MathEasyCubing a negative input
Advanced Math practice question
The function r is defined by r(x) = x³. What is the value of r(−2)?
Answer: -8 or −8
r(−2) = (−2)³ = (−2)(−2)(−2) = −8.
Common wrong answers
- If you answered 6
- 6 is 2 × 3 with the sign dropped.
- If you answered 8
- 8 has the wrong sign; an odd power of a negative number is negative.
- If you answered -6
- −6 is −2 × 3, multiplying instead of cubing.
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