Question

Help please.............................................

Answer 1

Answer:

Second option

$( - 7x + 4)( - 7x - 4)$

Step-by-step explanation:

If you multiply it out you get:

$49 {x}^{2} + ( - 7x \times - 4) + ( - 7x \times 4)- 16$

The two middle terms cancel out because of the sign difference of the two fours.

Result:

$49 {x}^{2} - 16$

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.

Answer 2

Answer:

B.

Step-by-step explanation:

(-7x + 4)(-7x - 4)

= 49x^2 - 28x + 28x - 16

= 49x^2 - 16.