Math, asked by Ankush8038, 8 months ago

plz solve this sum...

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Answered by DarshitaSharma122100

2

Answer:

(a+(-b) +c) ²=a²+b²+c²-2ab-2bc+2ca

=3²=40+2(-ab-bc+ca)

=9-40=2(-ab-bc+ca)

=-ab-bc+ca=31/2

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