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(4k+5) / (2k-5) = (2k-5)/K
k(4k+5) = (2k-5) (2k-5)
4k² +5k = 4k² - 10k-10k+25
5k=-20k + 25
25k = 25
k=1
-----------
k =1
2k-5= -3
4k+5=9
barisannya = 1, -3 ,9, -27
a=1 r= -3
S4 = a(r^4 -1) / (r-1)
= 1 (-3^4 -1) / (-3-1)
= (81-1) /(-4)
= 80/-4
= - 20