tolong kak pake caranya!!

6. 4x2 + 11x + 7 = (4x+7)(x+1)
4x 7
x 1

7. 9b2 + 18b + 8 = (3b+2)(3b+4)
3b 2
3b 4

8. 3r2 - 63r - 21 = (3r+1)(r-21)
3r 1
r -21

9. 11m2 - 23mn - 30n2 = (11m+10n)(m-3n)
11m 10n
m -3n

10. 3m2 - 16my - 12y2 = (3m+2y)(m-6y)
3m 2y
m -6y

Itu yg no8 mungkin soalnya harusnya 63r
Maaf kalo kurang bisa dipahami