Answer:
Second option
[tex]( - 7x + 4)( - 7x - 4)[/tex]
Step-by-step explanation:
If you multiply it out you get:
[tex]49 {x}^{2} + ( - 7x \times - 4) + ( - 7x \times 4)- 16[/tex]
The two middle terms cancel out because of the sign difference of the two fours.
Result:
[tex]49 {x}^{2} - 16[/tex]
Difference of squares. If the two multiplied brackets look exactly the same except for a sign difference in one of the terms (4 in this case) it is difference of squares.
