Given that a = (x, 2), B = (- 3, 5), and the angle between a and B is obtuse, then the value range of X is? Letter A. B is vector!

The angle between a and B is obtuse, so when a * B 10 / 3, the angle between a and B is obtuse

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1. Given that vector a = (2, x), vector b = (3, 4), and the angle between vector a and vector B is obtuse, then the value range of X is___ A.x>-2/3 B. X > - 2 / 3 and X ≠ 8 / 3 C. X2 / 3 and X ≠ 8 / 3
2. Given the vector a = (a, 2), B = (- 3, 5), and the angle between vector a and vector B is obtuse angle, the value range of a is obtained Given the vector a = (in, - 2), B = (- 3,5), and the angle between a and B is obtuse, then the value range of in
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