Question

find the value plzzzz​

Answer 1

Answer:

Step-by-step explanation:

x+y-z=4

squaring

x^2+y^2+z^2+2xy-2yz-2zx=16

30+2(xy-yz-zx)=16

2(xy-yz-zx)=-14

xy-yz-zx=-7

Answer 2

Hope this answer will help you.....