Question

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

Answer 1

Second option

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

Explanation:

If you multiply it out you get:

`49 {x}^(2) + ( - 7x * - 4) + ( - 7x * 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

B.

Explanation:

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

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

= 49x^2 - 16.