Question

Diketahui f:x → x^2-8x+12, x € B dan B = {x|-1≤ x ≤ 8}. Tentukan :
Domain
Nilai a jika f(a) = 5
tolong bantu ya buat besok =))

Answer 1

Domain = { -1,0,1,2,3,4,5,6,7,8}
 f(a) = a²-8a+12
5 =a²-8a+12
0= a²-8a+12-5
0=a²-8a+7
0 = (a-1)(a-7)
a= 1 atau a =7