Ответ:

1)3*(x-5)(x+5)

2)53^2-26*53+13^2=(53-13)^2=1600

3)(2x+3)^2-(2x-1)(2x+1)=46, 4x^2+12x+9-4x^2+1=12x+10=46, 12x=36, x=3

4)2x^2-18=2*(x-3)(x+3)

5)79^2-38*79+19^2=(79-19)^2=3600

6)(4x+1)^2-(4x-3)(4x+3)=42, 16x^2+8x+1-16x^2+9=42, 8x+10=42, 8x=32, x=4

Ответ:

1.

3(х-5)(х+5)

2.

1600

3.

х=3

4.

2(х-3)(х+3)

5.

3600

6.

х=4

Объяснение:

2.

2809-1378+169=1600

3.

4х²+12х+9-(4х²-1)=46

4х²+12х+9-4х²+1=46

12х+10=46

12х=46-10

12х=36

х=36/12

х=3

5.

6241-3002+361=3600

6.

16х²+8х+1-(16х²-9)=42

16х²+8х+1-16х²+9=42

8х+10=42

8х=42-10

8х=32

х=4