Question

Given the function f(x) = 3 x - 21 + 6, for what values of x is f(x) = 18?

Answer 1

18=3x-21+6
18=3x-15
33=3x
X=11

Answer 2

X=2

If 21+6=27 then subtract what f(x) is (which is 18) from the 27. 27-18=6 then 3x2=6 so therefore your answer is 2. Hope this helps!!