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(y+3)
JAWAB
◆ x - y = 3 → x = y + 3
◆ x² - 12x + 36 = 3y + 9
⇨ (y+3)² - 12(y+3) + 36 = 3y + 9
⇨ y² + 6y + 9 - 12y - 36 + 36 = 3y + 9
⇨ y² - 9y = 0
⇨ y(y - 9) = 0
⇨ y = 9
Untuk y = 9 maka
⇨ x = y + 3 = 9+3 = 12
HP = {12, 9}
x - 3 = y
3x - 9 = 3y (persm 1)
(x-6)(x-6) = 3y + 9
x^2 - 12x +36 = 3y + 9
x^2 - 12x +36 = 3x - 9 +9
x^2 - 15x + 36 = 0
(x-12)(x-3) = 0
x = 12 atau x = 3
kalau x =12 maka y =9
kalau x = 3 maka y = 0