Question

Sendo f(x)=3.x+1, calcule f(x+h)-f(x)

Answer 1

f(x)=3x+1
f(x+h)=3(x+h)+1
f(x+h)=3x+3h+1

y=f(x+h)-f(x)
y=(3x+3h+1)-(3x+1)
y=3x+3h+1-3x-1
####y=3h