I need help im stuck help precaluclus hw

Question

Find the horizontal intercepts of the function The intercepts are at  = 

Answer 1

0 = 2(x-4) -1

0 = 2x-8-1

0 = 2x-9

2x = 9

x = 9/2 is one x intercept

another is when

0 =-2(x-4) -1

0 =-2x +8 -1

0 = -2x +7

2x =7

x = 7/2 is the other x intercept

(3 1/2, 0) and (4 1/2, 0) are the two x intercepts

Answer 2

x-intercepts occur when f(x) = 0

0 = 2 |x - 4| - 1

1 = 2 |x - 4|

0.5 = |x - 4|

±0.5 = x - 4

4 ± 0.5 = x