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Which expression is defined for all real numbers?

a) x + 3/x^2
b) 5/(x + 2)^2
c)4/(x − 2)^2
d)7/x^2 + 3

  • alg2/trig - ,

    any time there is a fraction, the function is undefined when the denominator is zero.

    None of the choices is defined for all real numbers.

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