algebra
posted by renee on .
find the domain of each rational expression each polunomial must be fully factored and that you can only cancel factors you can not cancel terms. x^249 over 2x1 and x^214+49 over 12x

first one:
(x7)(x+7)/(2x1)
well all x are ok, except for x=1/2: division by zero is not defined.
range:
consider look at the transition of sign changes: at x=7, x=7, and x=1/2
at x=8, signs are */ or negative
at x=6, signs are *+/ or positive
at x= .55, signs are *+/+ or negative
at x=8, signs are +*+/+ or positive
so the range is from inf to +inf