first, replace the x in g(x)by 3 and work it out:- g(3) = -5(3) + 2 then plug this result into f(x) , 2x + 1
-5(3) + 2 = -15 + 2 = ?
so its -25?
correct now plug this into 2x + 1 and work it out that's your answer
got it thanks!
f(g(x)) = 2(-5x + 2) + 1
Yes you should explain to the user how to calculate f(g(x)) first before evaluating f(g(3)). The user may need to know how to do that, especially if asked to graph f(g(x)) for example.
yes - point taken