Question

Ajudem pfv quero resposta o quanto antes, obrigada

Answer 1

1.

$\: \: \: \: (x + 1)(x + 3) \\ = {x}^{2} + 3x + x + 3 \\ = {x}^{2} + 4x + 3$

2. a)

$\: \: \: \: (2x + 3)(x + 4) \\ = 2 {x}^{2} + 8x + 3x + 12 \\ = 2 {x}^{2} + 11x + 12$

2. b)

$\: \: \: \: \: (1 + 2y + y)(5 + y) \\ = (1 + 3y)(5 + y) \\ = 5 + y + 15y + 3 {y}^{2} \\ = 3 {y}^{2} + 16y + 5$

2. c)

$\: \: \: \: (x + 1)(x + 1) \\ = {x}^{2} + x + x + 1 \\ = {x}^{2} + 2x + 1$

2. d)

$\: \: \: \: (2x - 1)(x + 2) \\ = 2 {x}^{2} + 4x - x - 2 \\ = 2 {x}^{2} + 3x - 2$