Question

f(x) = x + 4, find f(3).
i did 3X=X+4
-1X = -1X +4
2X = 4
2X/2 =4/2
X = 2
what did i do wrong ?

Answer 1

f(x) = x + 4,
f(3) = (3) + 4 = 7

Answer 2

so its saying the 3 goes in for the x not f?

Answer 3

yeah the 3 is playing the role of the x

Answer 4

ohh so for \[4(x)=x^{2} +3 g(4) \] the answer would be 19 ?