If the vector u = 2 i + 4 j - 7 k and v = 2 i + 6 j + 6 + x k are perpendicular, then x =?

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If the vector u = 2 i + 4 j - 7 k and v = 2 i + 6 j + 6 + x k are perpendicular, then x =?

-4

4

2

5