2.
[tex] {(2a + 5)}^{2} \\ (2a + 5)(2a + 5) \\ 4 {a}^{2} + 10a + 10a + 25 \\ {4a}^{2} + 20a + 25[/tex]
3.
[tex] {(x - 7)}^{2} \\ (x - 7)(x - 7) \\ {x}^{2} - 7x - 7x + 49 \\ {x}^{2} - 14x + 49[/tex]
4.
[tex](3 {x}^{2} - 2c)( {3x}^{2} + 2c) \\ {9x}^{4} + 6c {x}^{2}- 6c {x}^{2} - 4 {c}^{2} \\ {9x}^{2} - 4 {c}^{2} [/tex]
5.
[tex] {(3x - 4)}^{2} + {(2x + 3)}^{2} + (2x + 1) \times (2x - 1) \\ 9 {x}^{2} - 24x + 16 + 4 {x}^{2} + 12x + 9 + 4 {x}^{2} - 2x + 2x - 1 \\ 17 {x}^{2} - 12x + 24[/tex]
6.
[tex] {(2y + 5)}^{2} + {(y - 3)}^{2} \\ {4y}^{2} + 20y + 25 + {y}^{2} -6y + 9 \\ 5 {y}^{2} + 14y + 34[/tex]
7.
[tex]9 {x}^{2} - 25 = (3x + 5)(3x - 5)[/tex]
8.
[tex] {x}^{2} - {a}^{2} = (x - a)(x + a)[/tex]
9.
[tex](a + 10)(b + c)[/tex]
10.
[tex] {(x + y + 5)}^{2} [/tex]
