The domain of the rational terms:
Because division by zero isn’t allowed, I have to find all values of x, that would cause division by zero.
In other words, to find the domain, I have to solve for the zeros of denominator.
Answer the following problems:
a) answer:
1 =
2x
2x ≠ 0 / : 2
x ≠ 0
0 is not allowed as an answer in this rational term.
b) answer:
4b =
(b – 7) * (2b + 5)
1. part of the denominator (b – 7):
b – 7 ≠ 0 / + 7
b ≠ + 7
2. part of the denominator (2b + 5):
2b + 5 ≠ 0 / – 5
2b ≠ – 5 / : 2
b ≠ – 2,5
– 7 and – 2,5 are not allowed as an answer in this rational term.
c) answer:
3 =
x – 7y
x – 7y ≠ 0 / + 7y
x ≠ + 7y
+ 7y is not allowed as an answer in this rational term.