Question

$4 {x}^{2} + {y}^{2} - 4xy =$
Factorise it plz​

Answer 1

4x² + y² - 4xy

= 4x² - 4xy + y²

= (2x)² - 2(2x)(y) + (y)²

= (2x - y)² ... (a-b)² = a² - 2ab + b²

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