The given expression is a quadratic expression. We would simplify by applying the factorisation method. We would determine two numbers whos sum or difference is 12 and whose product is - 28. These numbers are 14 and - 2. It becomes
[tex]\begin{gathered} 7x^2+12x-4 \\ 7x^2+14x-2x-4 \\ 7x(x+2)-2(x+2) \\ (7x-2)(x+2) \end{gathered}[/tex]The correct options are
A) (7x - 2)
B) ((x + 2)