Question

What is the excluded values?
1. 2x/1-2x
2. -7/x^2 -2x -15

Answer 1

the first answer is 1/2.
the second answers are -3 and 5.
I just had these questions on a test. I hope this helps you :)

Answer 2

Set each denominator equal to zero.
The values of x that cause the expression to be equal to zero are excluded from the domain.


1.
1 - 2x = 0
-2x = -1
x = 1/2

2.
x^2 - 2x - 15 = 0
(x - 5)(x + 3) = 0
x - 5 = 0 or x + 3 = 0
x = 5 or x = -3