Question

if X+y+z=9,XY+us+xx=40,find the value of X2+y2+z2.​

Answer 1

Answer:

(x+y+z)² = x²+y²+z²+ 2(xy+yz+zx)

putting all the values we get

=> x²+y²+z²= 9²-2(40) = 81-80 = 1. answer