dik: f(x)=x-3 dan g(x)=x+4 tentukan a). (fog) (x) dan b). (gof) (-4)

A. (fog) (x) = (x+4)-3
= X+1 ---hasilnya

B. (gof)(-4) = (x-3) + 4
= (-4-3) + 4
= -3 ---hasilnya

f(x) = x - 3
g(x) = x² + 4
a. (fog)(x)= g(x) - 3 = x² + 4 - 3 = x² + 1
b. (gof)(x) = (f(x))² + 4 = (x-3)² + 4
= x² - 6x + 9 + 4 = x² - 6x + 13

(gof)(-4) = (-4)² - 6(-4) + 13
= 16 + 24 + 13 = 53