Question

f(x)=5.x calcule f(x+h) - f(x)

Answer 1

$\boxed{f(x+h)-f(x)=5(x+h)-5x=5x+5h-5x=5h}$

Answer 2

Temos que $f(x)=5x$, então:

$f(x+h)=5\cdot(x+h)\\f(x+h)=5x+5h$


 Logo,

$f(x+h)-f(x)=\cancel{5x}+5h-\cancel{5x}\\\boxed{f(x+h)-f(x)=5h}$