Question

Suatu fungsi dinyatakan dengan f(x)= ax+b . nilai f(x)-f(x-1) adalah
a.-b
b.a
c.-a
d.b

tolong dijelaskan

Answer 1

F (x) = ax + b
f (x-1) = a(x - 1) + b
= ax - a + b

f (x) - f(x - 1) = (ax + b) - (ax - a + b)
= ax + b - ax + a - b
= ax - ax + b - b + a
= a