Question

$(x + {y})^{3} - ( x - {y})^{3} is \: equals \: \: to$
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Answer 1

Answer:

$2(3 x^{2} y +y^{3})$

Step-by-step explanation:

$(x + y)^{3} - (x - y)^{3}\\x^{3} +3x^{2} y +3xy^{2} +y^{3} - x^{3} +3x^{2} y -3xy^{2} +y^{3}\\6x^{2} y + 2y^{3}\\2(3 x^{2} y +y^{3})$