jika 5 pangkat8 : 5 pangkatn= 625,maka nilai (n-1) pangkat4 adalah... a. 49. c. 81 b. 64. d. 100 pake caranya ya..

[tex] {5}^{8} - {5}^{n} = {5}^{4} \\ {5}^{8 - n} = {5}^{4} \\ limanya \: dicoret \\ 8 - n = 4 \\ - n = 4 - 8 \\ - n = - 4 \\ n = 4[/tex]
[tex]{(n - 1)}^{4} \\ = {(4 - 1)}^{4} \\ = {3}^{4} \\ = 81[/tex]
jadi jawabannya C

[tex] {5}^{8} \div {5}^{n} = 625 \\ 625 = {5}^{4} \\ 8 \div n = 4 \\ n = 4 - 8 \\ n = - 4[/tex]