[tex](2 {x})^{2} = 4x ^{2} [/tex]
...........
[tex](3xy)^{2} = 9 {x}^{2} {y}^{2} [/tex]
............
[tex](2x + 1)^{2} = 4 {x}^{2} + 4x + 1[/tex]
............
[tex](3x + 4y)^{2} = 9 {x}^{2} + 24xy + 16y ^{2} [/tex]
FOLOSEȘTI:
[tex](a + b)^{2} = {a}^{2} + 2ab + {b}^{2} [/tex]