Jawabanmu

2014-02-05T18:28:42+07:00
D = b² - 4ac = (21)² - 4(17)(-3) = 441 + 204 = 645
2014-02-05T18:36:52+07:00
 D = b²-4ac
 D = 21²-4(17)(-3)
 D = 441-204
 D = 160