# alg2/trig

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

1. 0
2. 1
1. 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.

posted by Steve

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