If a+b+c=12 and a^2+b^2+c^2=64,find the value of ab+bc+ac
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(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
(12)^2=64+2(ab+bc+ca)
2(ab+bc+ca)=144-64
2(ab+bc+ca)=80
ab+bc+ca=40
HOPE THIS HELPS!!!
(12)^2=64+2(ab+bc+ca)
2(ab+bc+ca)=144-64
2(ab+bc+ca)=80
ab+bc+ca=40
HOPE THIS HELPS!!!
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2
the answer is in the pic..
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