If a^2 + b^2 +c^2=280 and ab+bc+ca=9/2, find the value of (a+b+c)^2.
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(a+b+c)^2 = a^2 +b^2 +c^2 +2(ab+bc+ca)
=280+2×9/2
=280+9=289 Ans
=280+2×9/2
=280+9=289 Ans
gautam011p9snux:
l don't think it is correct
really
then tell me your solution dear
l can't solve this question I am confused
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