Question

if X + Y + Z equal to 10 and X square + Y square + c square equals to 40 then find the value of x y + Y Z plus ZX​

Answer 1

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Answer 2

we know

(x+z+y)^2= x^2+y^2+z^2 +2 (xy+xz+zy )

putting values

10^2= 40 +2 (xy+zy+zx)

100-40 = 2 (xy+zx+zy)

30 = xy+zy+zx