Question

Prove that a. (b + c )x(a+2b+3c) = [ a b c ]

Answer 1

plz see ur answer in the pic

Answer 2

((a.b)×c)+((a.c)×c+((b.b)×c)+((b.c)×c) + ((a.b)×a)+((a.c)×a)+((b.b)×a)+((b.c)×a)

= [ a b c ]+[ a c c ]+[ b b c ]+[ a c c ] + [ a b a ]+[ a c a ]+[ b b a ]+[ b c a ]  

= [ a b c ] + [ b c a ] by rule 3

= [ a b c ]+[ a b c ] by rule 4

= 2[ a b c ]

hence proved

HOPE IT HELPED

PLEASE MARK BRAINLIEST