Next problem:

For each functionf(x), determine thisdifference quotientin a simplified form.(

fx+h) −f(x)

h

a.)f(x) = 2x+ 1

The problem I have here is that I understand all of the steps except for the first one, which is this:

2(x+h) + 1 − (2x+ 1)

h

The second part of the first step ((2) makes complete sense.x+ 1)

It's this I can't wrap my head around:

2(x+h) + 1

How doesturn thisf(x) = 2x+ 1into thisf(x+h)?

2(x+h) + 1