Answers

2014-11-12T18:27:43+08:00
Given function:
    f(x) = 4x - 3
for f(a+1).. just plug in the value of x which is a+1. so you'll have
f(x) = 4x - 3
f(a+1) = 4(a+1) - 3
f(a+1) = 4a + 4 - 3
f(a+1) = 4a +1
0