Question

factorise 3(x+y)-9(x+y)whole sqare

Answer 1

Answer:

3x+3y - 9x+9y

3x+ 9x - 3y+9 y

12x - 12y

Answer 2

[ 3 ( x + y ) - 9 ( x - y ) ] ²

[ 3x + 3y - 9x + 9y ] ²

[ - 6x + 12y ] ²

Using the identity (a + b) ² = a² + 2ab + b²

( - 6x ) ² + 2 x - 6x x 12y + ( 12y ) ²

36x² - 144xy + 144y²