Question

vi) 4 (a+b)²- 9 (a - b)²​

Answer 1

Answer:

-5a² - 5b² + 26ab  is the answer

Step-by-step explanation:

4(a + b)² - 9(a - b)²

4(a² + b² + 2ab) - 9(a² + b² - 2ab)

= 4a² + 4b² + 8ab - 9a² - 9b² + 18ab

= -5a² - 5b² + 26ab

Answer 2

Step-by-step explanation:

$4 {(a + b)}^{2} - 9 {(a - b)}^{2}$

$= {(2(a + b))}^{2} - {((3(a - b))}^{2}$

$= (2(a + b) + 3(a - b))(2(a + b) - 3(a - b))$

$= (5a - b)( - a + 5b)$

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