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math

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i am wondering if the following answer to my math problem is correct

f(x)=x^3-4x-2 [2,3]

the answer i put was f(20<o and f(3)>0

  • math -

    What is the meaning of the [2,3] after the definiton of f(x) ?

    f(3) = 27 -12 -2 = 13

    Why are you calculating f(20) ?

  • math -

    what are prime numbers

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