jika f(x)=3xpangkat2-2x+1 dan g(x)=x+3 maka (fog) (x) =...

jawab

f(x) = 3x² - 2x + 1
g(x) = x + 3

fog(x) = f {x+3)
= 3(x + 3)² - 2(x+3) + 1
= 3(x² +6x + 9)  - 2x - 6 + 1
= 3x² +18x + 27 - 2x - 6 + 1
= 3x² + 16x + 22

= (fog)(x)
= 3(x + 3)² - 2(x + 3) + 1
= 3(x² + 6x + 9) - 2x - 6 + 1
= 3x² + 18x + 27 - 2x - 6 + 1
= 3x² + 16x + 22