Question

x+y+z=10 and x2+y2+z2=30 then find the value of xy+yz+zx
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Answer 1

Answer:

35

Step-by-step explanation:

(x+y+z)^2 = x^2+y^2 + z^2+2(xy+yz+zx)

(10)^2=30+2(xy+yz+zx)

100-30= 2(xy+yz+zx)

70/2= xy+yz+zx

xy+yz+zx=35

hope it helps