Resposta:
a) [tex](2x + 1)(2x + 1) = 4x^2 + 2x + 2x + 1 = 4x^2 + 4x + 1[/tex]
b) [tex](3x - 2)(3x - 2) = 9x^2 - 6x - 6x + 4 = 9x^2 - 12x +4[/tex]
c) [tex](4x + 3)(4x - 3) = 16x^2 - 12x + 12x - 9 = 16x^2 - 9[/tex]
