Tolong bantuin jawab yaa....thankssss

3) (3 + 7m)² = 9 + 42m + 49m²
a = 9 , b = 42 , c = 49

4) (4m - 3n)² = 16m² - 24mn + 9n²
a = 16 , b = - 24 , c = 9

5) (5 - 8y)² = 25 - 80y + 64y²
a = 25 , b = - 80 , c = 64

6) (-4x + 9)² = 16x² - 72x + 81
a = 16 , b = - 72 , c = 81

7) (-3k + 3n)² = 9k² - 18kn + 9n²
a = 9 , b = - 18 , c = 9