G(x)=x-1 dan (f°g)(x)=2x²-4+3 maka fungsi f(x)

fog(x)=  2x²  -4 x + 3
f{g(x)} = 2x² - 4x  + 3
f(x-1) = 2x² - 4x + 3
f(x) = 2(x +1)² - 4(x+1) + 3
f(x) = 2(x²+ 2x +1) - 4x - 4 + 3
f(x) = 2x² + 4x + 2 - 4x - 4 + 3
f(x) = 2x² + 1