Grade 88 grade maths
If x+y+z=0 find x^2 (y+z) +y^2 (z+x) + z^2 (x+y)Generally for such questions we use x=2, y=z=-1 thus making x+y+z=0My query is, why can't we use x=-2, y=z=1, this also makes x+y+z=0?Both of these values are giving different answer in the above equation.Suggestions please. Thank you.
If x+y+z=0 find x^2 (y+z) +y^2 (z+x) + z^2 (x+y)
Generally for such questions we use x=2, y=z=-1 thus making x+y+z=0
My query is, why can't we use x=-2, y=z=1, this also makes x+y+z=0?
Both of these values are giving different answer in the above equation.
Suggestions please.
Thank you.
