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f(x)=2 |x-2| ; f(-2), f(x^2+2)

  • math -

    f(-2) = 2|-2-2) = 2|4| = 2(4) = 8

    f(x^2 + 2) = 2|x^2 + 2 - 2)|
    = 2|x^2| = 2x^2

    (x^2 is always positive anyway, so the |..| sign is redundant.

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