What is the domain of the function f(x)= x+1/x^2- 6x+8

all real numbers
all real numbers except -1
all real numbers except-4 and -2
all real numbers except 2 and 4

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.