题目内容
已知
={-2,3},
={k,-1}且(
+
)⊥(
-
),则实数k=______.
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| b |
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| b |
由题意,
+
=(-2+k,2),
-
=(-2-k,4)
∵(
+
)⊥(
-
),∴4-k2+8=0
∴k=±2
故答案为±2
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| b |
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∵(
| a |
| b |
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∴k=±2
| 3 |
故答案为±2
| 3 |
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