If a-b=3 and b-c=5,then find the value ofa^2+b^2+c^2-ab-bc-ca is?

1.	If a-b=3 and b-c=5,then find the value ofa^2+b^2+c^2-ab-bc-ca is?
Answer» assuming c-a=6(a-b)2=a2+b2-2ab=9..................... i(b-c)2=b2+c2-2bc=25....................ii(c-a)2=c2+a2-2ca=36.....................iiii + ii + iii2a2+2b2+2c2-2ab-2bc-2ca=70a2+b2+c2-ab-bc-ca=35

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