nomer 13 ya pake jalan juga

Bab Polinomial
Matematika SMA Kelas XI

x - 1 = 0
x = 1, sisa 4

x - 2 = 0
x = 2, sisa 7

f(2) = 2a + b = 7
f(1) = a + b = 4
------------------------- -
a = 3

a + b = 4
b = 4 - 3
b = 1

f(x) = 3x + 1

jawabannya C