Question

3. If a + b +c= 7, ab + bc + ca = 14. Find a + b
+ c.​

Answer 1

a+b+c=7

given in the question

I think you want the ans of a²+b²+c²

thus,

(a+b+c)² = a²+b²+c² +2(ab+bc+ca)

7²= a²+b²+c² + 2(14)

49-14 = 35 Ans...