Question

Any one can answer this.​

Answer 1

Answer:

yes why not

this the property

Answer 2

Answer:

(3a−5b−7c)

2

Using,(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

=(3a)

2

+(−5b)

2

+(−7c)

2

+2×3a×(−5b)+2×(−5b)×(−7c)+2×(−7c)×(3a)

=9a

2

+25b

2

+49c

2

−30ab+70bc−42ca