Question

expanded
(a+2b-c) ^2​

Answer 1

Answer:

(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

Given,

(a+2b+c)

2

=a

2

+(2b)

2

+c

2

+2a(2b)+2(2b)c+2ca

=a

2

+4b

2

+c

2

+4ab+4bc+2ac