[tex]a) {(3x)}^{2} + 2 \times 3x \times 1 + {1}^{2} = 9 {x}^{2} + 6x + 1[/tex]
[tex]b) {(2a)}^{2} + 2 \times 2a \times 3b + {(3b)}^{2} = 4 {a}^{2} + 12ab + 9 {b}^{2} [/tex]
[tex]c) {(5a)}^{2} - 2 \times 5a \times 2b + {(2b)}^{2} = 25 {a}^{2} - 20ab + 4 {b}^{2} [/tex]
[tex]e) {( - 4xy)}^{2} - 2 \times ( - 4)xy \times 3z + {(3z)}^{2} = 16 {x}^{2} {y}^{2} + 24xyz + 9 {z}^{2} [/tex]
