nomor 8,9,10 tolong dibantu dan caranya

8) - 3 ( 2a + b - 4) - 5(a - 2b + 3 )
= - 6a - 3b + 12 - 5a + 10b - 15
= - 6a - 5a - 3b + 10b + 12 - 15
= - 11a + 7b + 3 (B)

9) (p² + pq + q²) + (2p² - q² - 4pq)
= p² + 2p² + pq - 4pq + q² - q²
= 3p² - 3pq ( B)

10) (x + 3)(x - 7)
= x² + 3x - 7x - 21
= x² - 4x - 21 ( A)