Question

If a^2+b^2+c^2=280 and ab+bc+ca=9/2/, find (a+b+c)^2?

Answer 1

Answer:

We know that,

(a+b+c)²=a²+b²+c²+2(ab+bc+ac)

From this,

(a+b+c)²=280+2(9/2)

=280+9=289

Step-by-step explanation:

Hope it helps you.....