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Maka, rumus f(x) yaitu f(x) = x + 2.
Jika f(x) = x + 2, maka:
=> f(5) = 5 + 2 = 7.
(f(x) +f(5))dari f(x-5)=x-3
f(x-5)-(fx+5f)=x-3
f(x-5)-fx-5f=x-3
fx-5f-fx-5f=x-3
fx-fx-5f-5f=x-3
0-10f=x-3
-10f=x-3
note:
"dan"artinya ditambah
"dari"artinya dikurang tapi, di balik dulu, dari belakang pindah ke depan