alg2/trig
posted by jaz .
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

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.