Question

please please answer for this question please please please please who will answer for this question i will mark as a brainlist

Answer 1

Answer:

21a² + 3b² - 16ab

Step-by-step explanation:

Given : (5a - 2b)² - (2a - b)²

Identity : (x - y)² = x² + y² - 2xy

→ [ (5a)² + (2b)² - 2(5a)(2b) ] - [ (2a)² + (b)² - 2(2a)(b) ]

→ [ 25a² + 4b² - 20ab ] - [ 4a² + b² - 4ab ]

→ 25a² + 4b² - 20ab - 4a² - b² + 4ab

→ 21a² + 3b² - 16ab

Answer 2

Answer:

21a^2-16ab+3b^2

Step-by-step explanation:

check the attachment