x^2+2x^2=3x^2
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Only when X or Y = 0 That is because (x + y) squared = x^2 + 2xy + y^2 x^2 + 2xy + y^2 = x^2 + y^2 when x or y = 0
If I have this correct you are asking x^2 + 10^2 = 12^2 Then x=6.633249507108
If you mean: (x+3) squared = (x+2) squared +11 Then the value of x works out as 3
2x2 + 28xy + 98y2 = 2(x + 7)2.
x^2 + 3x + 2/(-3x) - x^2 - 2=3x-2+2/(-3x)=3x-2-2/(3x)