Question

If a^2+b^2+c^2=74 and ab+bc+ca,find a+b+c.

Answer 1

Answer:

is there a value given for ab+bc+ca ?

if ye then put the value in the place of (ab+bc+ca) and solve it like this--

(a+b+c)^2 =a^2+b^2+c^2 + 2(ab+bc+ca)

"". => 74+2(ab+bc+ca)