factorise the following expression
Attachments:
Answers
Answered by
5
Q. Factorisation »
9z² - x² - 4y² + 4xy
= 9z² - (x² + 4y² - 4xy)
= (3z)² - [(x)² + (2y)² - 2(x)(2y)]
= (3z)² - (x - 2y)²
= [3z + (x - 2y)] [3z - (x - 2y)]
= (3z + x - 2y) (3z - x + 2y)
Answer » (3z + x - 2y) (3z - x + 2y)
Identities Used »
1. a² + b² - 2ab = (a - b)²
2. a² - b² = (a + b) (a - b)
✪ Be Brainly ✪
Similar questions