Answers

2016-07-20T20:06:29+08:00
2(2) + 1 = 5
3(2) + 4 = 10
7(2) + 6 = 20
0
2016-07-20T20:18:54+08:00
(3k+4)/(2k+1) = (7k+6)/(3k+4)
(3k+4)^2 = (7k+6)(2k+1)
9k^2 + 24k + 16 = 14k^2 +19k + 6
24k-19k + 16 - 6 = 14k^2 - 9k^2
5k + 10 = 5k^2
0 = 5k^2 - 5k - 10

(5k + 5)(k-2)

5k = -5
5k/5 = -5/5
k= -1

k = 2

Therefore, k =  -1 and k = 2
1 5 1