if a+b+c=6 and a^+b^+c^=20=find Ab +bc+ca
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(a+b+c)^2=a^2+b^2+c^2 +2(ab+bc+ca)
36=20+2(ab+bc+ca)
(ab+bc+ca)=16/2=8
36=20+2(ab+bc+ca)
(ab+bc+ca)=16/2=8
samaf:
is it correct?!?
plz explain
yep
I used the formula (a+b+c)^2
OK thanks!
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