9(x + y)^2 – 16 (x – 2y)^2
Attachments:
Answers
Answered by
23
Answer:
hope it's help you‼️‼️☑️☑️
Attachments:
Answered by
11
Answer:
- 7x² - 55y² + 82xy
Step-by-step explanation:
Given : 9(x + y)² - 16(x - 2y)²
Identity : (a + b)² = a² + b² + 2ab
(a - b)² = a² + b² - 2ab
→ 9 [ (x)² + (y)² + 2(x)(y) ] - 16 [ (x)² + (2y)² - 2(x)(2y) ]
→ 9 [ x² + y² + 2xy ] - 16 [ x² + 4y² - 4xy ]
→ 9x² + 9y² + 18xy - 16x² - 64y² + 64xy
→ 9x² - 16x² + 9y² - 64y² + 18xy + 64xy
→ - 7x² - 55y² + 82xy
Similar questions