Объяснение:

1.

[tex]p {}^{2} - (x {}^{2} + 6x + 9)[/tex]

[tex] = p {}^{2} - (x - 3) {}^{2} [/tex]

[tex] = (p - (x - 3)) \times (p + (x - 3))[/tex]

[tex] = (p - x + 3) \times (p + x - 3)[/tex]

2.

[tex]c {}^{3} \times (ac - c + a + 1)[/tex]

3.

[tex]m \times (100 + m {}^{3} )[/tex]