suatu fungsi dirumuskan f(x)= 7x - 1, jika f(a) =48 f(b) = -22 maka nilai a+b adalah

f(a) = 48
7a - 1 = 48
7a = 49
a = 7


f(b) = -22
7b - 1 = -22
7b = -21
b = -3

a+b = 7+(-3) = 4

f(x)= 7x -1
f(48)= 7x -1
f = 7(48) -1
f = 336 -1
f = 335

f(x)= 7x -1
f(-22)= 7x -1
f = 7(-22) -1
f = -154 -1
f = -155

Jumlah a + b=
335 + -155 = 180