Question

What is the answer if x=2.2

Answer 1

-1/2(2.2)+3(2.2)^2-2=11.42
All you need to do is enter 2.2 wherever 'x' is! Hope that helps!

Answer 2

Substitute each 2.2 for each x.  Don't forget to square 2.2 for x^2
-1/2(2.2)+3(2.2)(2.2)-2
Now simplify.
-1.1+14.52-2=11.42

Hope that helps.  Feel free to ask any questions.