a+b-c=7 andab-bc-ca=14 then find a²+b²+c²
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(a+b-c)²=a²+b²+c²+2(ab-bc-ca)
a²+b²+c²=49-2(ab-bc-ca)
=49-28
=21
a²+b²+c²=49-2(ab-bc-ca)
=49-28
=21
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