Question

Нужно решение, срочно. 30 баллов

Answer 1

(2x+3y)² = 4x² + 12xy + 9y²

(5a-2b)² = 25a² - 20ab + 4b²

(3b-4a)² = 9b² - 24ab + 16a²

(5a+3b)² = 25a² + 30ab + 9b²

Answer 2

$1) \: (2x + 3y {)}^{2} \\ 2 {x}^{2} + 2 \times 2x \times 3y + 3y {}^{2} \\ 4 {x}^{2} + 12xy + 9 {y}^{2} \\ \\ 2) \: 5 {a}^{2} - 2 \times 5 \times 2b + 2 {b}^{2} \\ 25 {a}^{2} - 20ab + 4 {b}^{2} \\ \\ 3) \: (3b - 4a {)}^{2} \\ 3 {b}^{2} - 2 \times 3b \times 4a + 4 {a}^{2} \\ 9 {b}^{2} - 24ab + 16 {a}^{2} \\ \\ 4) \: (5a + 3b {)}^{2} \\ 5 {a}^{2} + 2 \times 5a \times 3b + 3 {b}^{2} \\ 25 {a}^{2} + 30ab + 9 {b}^{2}$