Question

(x-y) ^3=x^3-y^3-3xy(x-y) proof this formula ​

Answer 1

➡➡❤(X+y)^3 = (x+y)(x+y)^2

➡➡❤Open brackets

➡➡❤(X+y)(x^2+2xy+y^2)

➡➡❤X^3 +2yx^2+xy^2 + y^3 + 2xy^2 + yx^2

➡➡❤X^3 + 3yx^2+3xy^2 + y^3

thank you ❤