16Hit1600
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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