Question

F x equals 3x squared + 6 x - 7

Answer 1

Not sure the question but the only one that makes since is Line 1....
3*x^2 =6x^2
3*2x=6x
and the -7 its just in a different form

Answer 2

The answer is line 1. 
If you solve the equation, line 1 is the only one that matches.