Question

the expansion of (x-y) whole cube is​

Answer 1

Step-by-step explanation:

$( {x + y})^{3} \\ = (x + y)(x + y)(x + y) \\ = ( {x + y)}^{2} (x + y) \\ = ( {x}^{2} + {y}^{2} + 2xy)(x + y) \\ = x ( {x}^{2} + {y}^{2} + 2xy) + y ( {x}^{2} + {y}^{2} + 2xy) \\ = {x}^{3} + {xy}^{2} + 2 {x}^{2} y + {x}^{2} y + {y}^{3} + 2x {y}^{2} \\ = {x}^{3} + 3 {x}^{2} y + 3x {y}^{2} + {y}^{ 3 }$