Question

please give answer in brief​

Answer 1

Step-by-step explanation:

A) x² + 7x + 3x + 21

x² + 10x + 21

B) (2y)² + 10y + 10y + 25

4y² + 20y + 25

C) (2a)² - 14a - 14a + 49

4a² - 28a + 49

D) (6x)² + 42x - 42x - 49

36x² - 49

E) (7a)² - 63ab - 63ab + (9b)²

49a² - 126ab + 81b²

F) (4x)² - 4x - 20x + 5

16x² - 24x + 5