Explicação passo-a-passo:
[tex]a)(x + y) {}^{2} = x {}^{2} + 2xy + y {}^{2} . \\ b) (y + 5) {}^{2} = y {}^{2} + 10y + 25. \\ c)(2x + 3) {}^{2} = 4x {}^{2} + 12x + 9. \\ d)(5x + 6y) {}^{2} = 25x {}^{2} + 60xy + 36y {}^{2} . \\ e)(3x + 1) {}^{2} = 9x {}^{2} + 6x + 1.[/tex]
