if a+b+c=9 and ab+bc+ca=26,find a2+b2+c2
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ans is 29 please mark me as brainliest
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vaishakh71:
tha6
thanks
you are welcome
his ans is wrong vaishakh
plz mark as brainliest
vaishakh71 can you mark my answer as brainliest
Answered by
1
(a+b+c)2=a2+b2+c2+2ab+2bc+2ca
(9)2=a2+b2+c2+2(ab+bc+ca)
81=a2+b2+c2+2(26)
81=a2+b2+c2+52
81-52=a2+b2+c2
29=a2+b2+c2
(9)2=a2+b2+c2+2(ab+bc+ca)
81=a2+b2+c2+2(26)
81=a2+b2+c2+52
81-52=a2+b2+c2
29=a2+b2+c2
it's completely wrong!!!!!
how????
you have used wrong formula in first step
OK
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