Question

2. If x - y + z = 5 and x2 + y2 + z2 = 49, find
the value of : zx - xy – yz.​

Answer 1

Answer:

-24

Step-by-step explanation:

x-y+z=5

(x-y+z)^2=5^2=25

(x-y+z)^2=x2+y2+z2+zx-xy-yz

25=49+zx-xy-yz

25-49=zx-xy-yz

-24=zx-xy-yz