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needhelpfastplease Group Title

What is the value of the expression –3x^3 when x = –3? A. –81 B. –27 C. 27 D. 81

  • 5 months ago
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  1. needhelpfastplease Group Title
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    @kym02

    • 5 months ago
  2. kym02 Group Title
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    Did you work it out?

    • 5 months ago
  3. needhelpfastplease Group Title
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    i tried to @kym02 i think its C but im not quite sure

    • 5 months ago
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    Alright i'll go it through with you. \[-3x^{3}\] Hence, \[x=-3\] so, \[(-3) \times (-3) \times (-3) = -27\] so basically it now becomes: \[-3(-27)\] which is equal to: \[81\] Therefore, the answer is D :) you had it! just needed to keep trying! :D

    • 5 months ago
  5. needhelpfastplease Group Title
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    thank you!

    • 5 months ago
  6. kym02 Group Title
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    you're welcome!

    • 5 months ago
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