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Which value(s) of x should be excluded for the polynomial?

x squared minus 16 over x squared minus 6x + 9
A. 3
B. 3 and -3
C. 4
D. 4 and -4

  • math -

    (x^2 - 16)/(x^ - 6x + 9)
    = (x^2 - 16)/(x-3)^2

    The only thing we have to worry about is not dividing by zero.
    This will happen if x = 3

    so the exclusion: x = 3 , looks like A)

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