diketahui f(x) = 4x+7 jika f(a) =-11 dan f(2) =b nilai a-b adalah

a=4x+7
b=f2
=a-b
-11-4x+7=-4x-4

f(x) = 4x + 7

f(a) = -11
4.a + 7 = -11
4a + 7 = -11
4a = -11 - 7
4a = -18
a = -18/4 = -4 1/2....(negatif empat setengah)

f(2) = b
4.2 + 7 = b
8 + 7 = b
15 = b

a - b
= -4 1/2 - 15
= -19 1/2


Maaf klo salah.....