Question

if x+y+z =10,X2+y2+z2 = 40 then find xy+yz+xz​

Answer 1

Answer:

30

Step-by-step explanation:

Use the formula (x+y+z)²=x²+y²+z² + 2(xy+yz+zx)

Substituting the values, we get

100=40+2(xy+yz+zx)

or xy+yz+zx=60/2

=30