Question

Answer 1

a,

= 3 ( x² - 4y² )

= 3 ( x - 2y ) ( x + 2y )

Answer 2

a) \(3x^2-12y^2=3\left(x^2-4y^2\right)=3\left(x-2y\right)\left(x+2y\right).\)

b) \(x^2-y^2-4x+4=\left(x-2\right)^2-y^2=\left(x-2-y\right)\left(x-2+y\right).\)

Answer 3

b, x² - y² - 4x + 4

= ( x² - 4x + 4 ) - y²

= ( x - 2 )² - y²

= ( x - 2 - y ) ( x - 2 + y )