
Andrew M. answered 07/14/16
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
f(x) = 4x
This merely means that for any input value "x" to find the output
value we just multiply it by 4.
f(x+1) = 4(x+1) = 4x+4
f(x) = 4x
f(x+1) - f(x) = 4x+4-4x = 4