Mohon bantuannya.. Terima kasih..

Kelas 8 Matematika
Bab Aljabar

a] 18 (2 - 4 (7 - 12))
= 18 (2 - 4 (-5))
= 18 . (2 + 20)
= 18 . 22
= 396

b] (4x - 11) (3x - 7)
= 12x² - 28x - 33x + 77
= 12x² - 61x + 77

c] (5x - 8)²
= (5x)² - 2 . 5x . 8 + 8²
= 25x² - 80x + 64