Tolong dijawab...dikumpul skrng kk/abng!!!

jawab

(12)

y = x² -4x + 5
y =  2x - b

x² - 4x + 5 = 2x - b
x² - 6x + (5 +b)= 0
a = 1, b = -6, c = (5+b)
syarat  akar berbeda D >  0
b² - 4ac > 0
(-6)² -4(1)(5+b) > 0
36 -20  - 4b > 0
16 - 4b > 0
-4b > -16
b <  (-16./-4)
b < 4