Mathematics Determinants

If a ≠ 0, \(\left|\begin{array}{ccc} x+a & x & x \\ x & x+a & x \\ x & x & x+a^2 \end{array}\right|=0\) represents

1
a straight line parallel to x-axis
2
a straight line parallel to y-axis
3
a parabola
4
a circle
5
a ellipse 

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