Mathematics Determinants Evaluation of Determinants

If - 9 is a root of the equation \(\left| {\begin{array}{*{20}{c}} x&2&7\\ 2&x&2\\ 7&7&x \end{array}} \right|\) = 0, then the other two roots are

1

2, 7

2

-2, 7

3

2, -7

4

-2, -7

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