Question

find the value of a^2+b^2+c^2 when a+b+c=7 & ab+bc+ca=15​

Answer 1

Answer:

a²+b²+c² = 19

Explanation:

It is given that,

a+b+c = 7 ----(1)

ab+bc+ca = 15 ----(2)

Now ,

a²+b²+c²

= (a+b+c)²-2(ab+bc+ca)

= 7²-2×15

= 49 - 30

= 19

Therefore,

a²+b²+c² = 19

••••

Answer 2

19 is the answer

a=1

b=3

c=3