Ada nggak yang bisa bantu jawab soal MTK tentang komposisi.. soalnya kayagini ... fungsi f:R --> R dan g:R --> dengan f(x) = x-3 dan g(x)= x²+ 5. jika (gof)(x)= (fog)(x) maka x=.... a. 1 b.2 c.3 d.4 e.5
hendrisyafa
Gof = g (f(x)) = g (x-3) = (x-3)²+5 =x²-6x+9+5 = x²-6x+14
fog = f( g(x)) = f (x²+5) = x²+5-3 = x²+2
gof = fog x²-6x+4 = x²+2 x²-x²-6x = 2-4 -6x = -2 x = 1/3
= g (x-3)
= (x-3)²+5
=x²-6x+9+5
= x²-6x+14
fog = f( g(x))
= f (x²+5)
= x²+5-3
= x²+2
gof = fog
x²-6x+4 = x²+2
x²-x²-6x = 2-4
-6x = -2
x = 1/3