Factoriser 1) 49a² - 42a + 9 2) (x-1)² - 16 3)81 - 64t²
Mathématiques
uawen39
Question
Factoriser
1) 49a² - 42a + 9
2) (x-1)² - 16
3)81 - 64t²
1) 49a² - 42a + 9
2) (x-1)² - 16
3)81 - 64t²
1 Réponse
-
1. Réponse Anonyme
1) 49a² - 42a + 9
= (7a - 3)²
2) (x - 1)² - 16
= (x - 1)² - 4²
= (x - 1 + 4)(x - 1 - 4)
= (x + 3)(x - 5)
3) 81 - 64t²
= 9² - (8t)²
= (9 + 8t)(9 - 8t)