Answer:

1.(×-7)(×+7)= x²-49

2.(×-6)²= x²-12x+36

3.(3×-1)²= 9x²-6x+1

4.(×-4)(×+4)= x²-16

5.(3×-1)(4×-1)= 12x²-7x+1

Answer:

1. x²-14

2. x²-12x+36

3. 9x²-6x+1

4. x²-16

Step-by-step explanation:

1. (x-7)(x+7)=x²+7x-7x-14=x²-14

2.  (x-6)²=x²-6x-6x+36=x²-12x+36

3. (3x-1)²=9x²-3x-3x+1=9x²-6x+1

4. (x-4)(x+4)=x²+4x-4x-16=x²-16