Question

4x2-6 If x = 3 then has a value of what? X

Answer 1

I did not understand quite well, but I am assuming two possibilities, I hope it will be helpful.
If you meant what is the result 4x^2-6 if x equals to 3:
4(3)^2-6
12^2-6
144-6
=138

If you meant 4x(2)-6
4(3)(2)-6
12(2)-6
24-6
=18

Hope I could help!