g(x)=-x+3 dan (f°g)(x)=4x²-26x+32 nilai f(1) = ?

Kelas 10 Matematika
Bab Fungsi Komposisi

(fog) (x) = 4x² - 26x + 32
f(-x + 3) = 4x² - 26x + 32

-x + 3 = 1
-x = 1 - 3
x = 2

4x² - 26x + 32
= 4 . 2² - 26 . 2 + 32
= 16 - 52 + 32
= -4