a2+b2+c2=29 a+b+c=9 find ab+bc+ca Share with your friends Share 0 Saksham Tolani answered this Dear Student, I am assuming that the question is "a2+b2+c2=29, a+b+c=9 find ab+bc+ca." (a+b+c)2=a2+b2+c2+2(ab+bc+ca)92=29+2(ab+bc+ca)81-29=2(ab+bc+ca)ab+bc+ca=522ab+bc+ca=26 Regards. 0 View Full Answer Julius Caesar answered this Use the identity (a+b+c)^2 a^2+b^2+c^2+2(ab+bc+ca) => 81 29+2(ab+bc+ca) => 81 ab+bc+ca =>26 0
