Algebra 2
posted by Gabby on .
Find all numbers that must be excluded from the domain of the given rational expression.
1) x^2+4x/x^216
2) 6x^3y6xy/x^3+5x^2+4x
3) 4x^2/x^2+x6

look at the denominators.
a. (x4)(x+4)
b. x(x+5)(x+1)
c. (x+3)(x2)
now I ask you: what values of x in each of these will make the product zero?