Saya Bantu Jawab Yak Kak Or Bang :

1. Persamaan Kuadrat

2x²- x - 1 = 0

x² - (1/2)x - (1/2) = 0

x² - (1/2)x = (1/2)

x² - (1/2)x + (1/16) = (1/2) + (1/16)

(x - 1/4)² = (9/16)

x - 1/4 = ± √(9/16)

x - 1/4 = 3/4 atau -3/4

x - 1/4 = 3/4

x = 3/4 + 1/4

x = 1

x -1/4 = -3/4

x = -2/4

x = -1/2

Simak lebih lanjut di Brainly.co.id - yomemimo.com/tugas/12709053#readmore

Terimakasih Atas Pertanyaan Anda !

2. dibagi 3 dulu

x² - (2/3)x = 8/3

(x - (1/2)(2/3))² = 8/3 + (1/3)²

(x - (1/3))² = 16/9 + 1/9

(x - (1/3))² = 17/9

x - (1/3) = +- √17/9

x - (1/3) = +- (1/3)√17

x = (1/3)√17 + 1/3 atau x = (1/3) - (1/3)√17