f(x)= 4x+3 what is f(x+h) - f(x) divided by h

Answer 1

just plug in the values:

f(x) = 4x+3
f(x+h) = 4(x+h)+3

f(x+h)-f(x) = (4x+4h+3) - (4x+3) = 4h

(f(x+h) - f(x))/h = 4h/h = 4

Answer 2

4x-1 / 2x^2+3