2b+3)(b-4 tolong jawab

2b . b = 2b^2

2b . -4 = -8b

3 . b = 3b

3 . -4 = -12

[tex] = {2b}^{2} - 8b + 3b - 12[/tex]
[tex] = {2b}^{2} - 5b - 12[/tex]

2b²-8b+3b-12
2b²-5b-12