If ab + bc + ca = 36
a^2 + b^2 + c^2 = 85
Find a + b + c.
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Answered by
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according to your question
(a+b+c)^2= (a^2+b^2+c^2)+2(ab+bc+ca)
putting the above values
=(85)+2(36)
=85+7
(a+b+c)^2=157
a+b+c=√157
(a+b+c)^2= (a^2+b^2+c^2)+2(ab+bc+ca)
putting the above values
=(85)+2(36)
=85+7
(a+b+c)^2=157
a+b+c=√157
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