If 15 + x,28 – x, and 29 + x form an arithmetic sequence what is the value of x?

3.

Step-by-step explanation:

If its an AS it well have a common difference, so 3rd term - 2nd term should = 2nd term - first term:-

29 + x - (28 - x) =  28 - x - (15 + x)

2x + 1 = 13 - 2x

4x = 12

x = 3.

The sequence is

15 + 3, 28-3, 29 + 3

= 18, 25, 32

which is arithmetic with common difference 7.

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb