a-b+ab,b-c+bc,c-a+ac
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Answer:
a-b+ab,b-c+bc,c-a+ac
=a-b+b-c+c-a+ab+bc+ca
=+a-a+c-c+b-b+ab+bc+ca
=+a-a+b-b-c+c cancel
= ab+bc+ca
or
= take +ca on right side
so,ab+bc=-ca
or
= take+bc on right side
ab+ca=-bc
or
= take+ab on right side
bc+ca=-ac
Hence proved
thank you
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