tolong dibantu yaa dijawab pakai cara please

9x² - 5x + 9 + 20 + 4x² - 7x
= 9x² + 4x² - 5x - 7x + 9 + 20
= 13x² - 12x + 29
Jawaban : A

(4x - 5x²) - (-8x² + 9)
= 4x - 5x² + 8x² - 9
= -5x² + 8x² + 4x - 9
= 3x² + 4x - 9
Jawaban : B

Semoga membantu :)