answer the attachment
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As we know that
(a+b+c)^2= a^2+b^2+c^2+2ab+2bc+2ca
on putting the value of a^2+b^2+c^2=35
(a+b+c)^2= 35+2(ab+bc+ca)
again, on putting the value of ab+bc+ca=23
(a+b+c)^2= 35+2×23
(a+b+c)^2= 35+46
a+b+c= √81
therefore, a+b+c= 9
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