Question

If a+b+c=15 and ab+bc+ca=74. Find (a2+b2+c2).

Answer 1

Answer:

(a+b+c)^2= a2+b2+c2+ 2 (ab+bc++ca)

225 (15×15)÷ 148(2×74)= a2+b2+c2

a2+b2+c2= 225÷148=1.5

I hope it helps u

Answer 2

Refer to the attachment !