Question

simplify 2. ( x 2 - 2y) (x + y) - 3x (4 - y)​

Answer 1

Answer:

$= ({x}^{2} - 2y)(x + y) - 3x(4 - y) \\ \\ = {x}^{2} (x + y) - 2y(x + y) - (12x - 3y) \\ \\ = {x}^{3} + {x}^{2} y - 2 {x} + 2 {y}^{2} - 12x + 3y \\ \\ = {x}^{3} + {x}^{2} y + {y}^{2} + 3y - 2x - 12x \\ \\ = {x}^{3} + {x}^{2} y + {y}^{2} + 3y - 14x$

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