Question

Simplify and find all numbers that must be excluded from the domain of the simplified rational expression?

a. 1
b. 0
c. -1 and 8
d. 8
e. -1

Answer 1

which expression? xD

Answer 2

8-x over x^2-7x-8

Answer 3

well.. an alternate form is:

1/(-x-1)

so the domain is |R \ {-1}, cause if you substitute the "x" on the dominator by (-1) the equation will be:

1/0 which is impossible

Answer 4

so a and b?

Answer 5

No. Only e) -1