Question

what is the expansion of (a-b-c)²​

Answer 1

Answer:

a²+b²+c²-2(ab+ac-bc)

Step-by-step explanation:

(a-b-c)²

(a-b-c) (a-b-c)

a(a-b-c)-b(a-b-c)-c(a-b-c)

a²-ab-ac-ab+b²+cb-ac+bc+c²

a²+b²+c²-2ab-2ac+2bc

a²+b²+c²-2(ab+ac-bc)

Answer 2

(a-b-c)^2

(a^+(-b)^2+(-c)^2}2

a^2+(-b)^2+(-c)^2+2(-b)+2(-c)a

=a^2+b^2+c^2-2ab+2bc-2ca is the answer