Question

(a+-b)3=a3+3a2b++3ab2+-b3​

Answer 1

(a-b) ^3= (a-b) (a-b)^2

(a-b)^3= (a-b) (a^2+b^2-2ab)

(a-b)^3= a^3+ab^2-2ba^2-ba^2-b^3+2ab^2

(a-b)^3=a^3+3ab^2-3ba^2-b^3

(a-b)^3= a^3-b^3-3ba^2+3ab^2

(a-b)^3=a^3-b^3-3ab(a-b)

Thank you!