Question

Factorise : x square - 2y + xy - 4

Answer 1

x² - 2y + XY - 4

x² - 4 - 2y + xy

= (x² - 2²) - y( 2 - x )

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

= ( X - 2 ) ( X + 2 + y)