tolong bantu jawab dong

14 = (2x-1)²-3(2x-1)+4
14 = 4x²-4x+1-6x+3+4
14 = 4x²-10x+8
4x²-10x-6=0 (dibagi 2)
2x²-5x-3=0
(2x+1)(x-3)=0
2x=-1
x=-½, dan x=3

Semoga bermanfaat .. Itu kalo saya gak salah hitung, kalo salah hapus saja ..

f(x) = x² - 3x + 4
g(x) = 2x - 1
fog(x) = (2x - 1)² - 3(2x - 1) + 4 = 14
          = 4x² - 4x + 1 - 6x + 3 + 4 - 14 = 0
          = 4x² - 10x - 6 = 0
          = 2x² - 5x - 3 = 0
          = (x - 3)(2x + 1) = 0
x = 3 atau x = -1/2