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Verified answer
Persamaan Kuadrat49x² - 56x + 1 = 0
Saya selesaikan dgn melengkapkan kuadrat sempurna
49x² - 56x + 1 = 0
49x² - 56x = -1
------------------------ ÷ 49
x² - (56/49)x = -1/49
x² - (8/7)x = -1/49
Tambahkan kedua ruas dengan 16/49
x² - (8/7)x + 16/49 = -1/49 + 16/49
-->
x² - 2(4/7)x + (4/7)² = 15/49
(x - 4/7)² = 15/49
x - 4/7 = √(15/49)
x - 4/7 = ±(√15)/7
x1 = (4 + √15) /7
x2 = (4 - √15) /7
bisa juga diselesaikan dgn rumus abc
dgn x12 = (-b ± √b² - 4ac)/2a