Question

A+b+c+=9 and a^2+b^2+c^2=35 then fnd the vlue of ab+bc+ca

Answer 1

(a+b+c)^2 = a2+ b2 + c2 +2(ab +BC+ac)
by substituting the values
9^2 = 35 + 2(ab + BC + ac)
81-35 = 2 (ab +BC + ac)
46/2 = ab + BC + ac
23 = ab + BC + ac

Hope it helps!!

Answer 2

We know
(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ac
From given data
9^2=35+2(ab+bc+ac)
81-35=2(ab+bc+ac)
46. =2(ab+bc+ac)
Therefore ab +bc+ac =23
Hope it helps you.Mark as brainiest