Question

Factorise: 9(a+b)^2-25(a-b)^2​

Answer 1

Answer:

Its very hard! which std?

Step-by-step explanation:

Answer 2

Step-by-step explanation:

$= 9 {(a + b)}^{2} - 25 {(a - b)}^{2}$

$= {(3(a + b))}^{2} - {(5(a - b))}^{2}$

$= {(3a + 3b)}^{2} - {(5a - 5b)}^{2}$

$= ((3a + 3b) + (5a - 5b))((3a + 3b) - (5a - 5b))$

$= (3a +5a + 3b - 5b)(3a - 5a + 3b + 5b)$

$= (8a - 2b)(8b - 2a)$

$= 2(4a - b)(4b - a).$

I HOPE THAT THIS MAY HELP YOU

PLEASE MARK MY ANSWER AS BRAINLIEST.