Question

Please show work so I can see how to do it.

Answer 1

a. D = R \ {13}

b. D = [-9;+∞)

D = R \ {
`(-1)/(2)` }

Explanation:

a. 13 - x ≠ 0

x ≠ 13

D = R \ {13}

b. 9 + x ≥ 0

x ≥ -9

D = [-9;+∞)

c. 2x + 1 ≠ 0

x ≠
`(-1)/(2)`

D = R \ {
`(-1)/(2)` }