Let $L$ be the line in space that passes through the origin and the point $(2,1,-2).$  Find the reflection of the point $(3,6,15)$ across $L.$
Question:
Let $L$ be the line in space that passes through the origin and the point $(2,1,-2).$  Find the reflection of the point $(3,6,15)$ across $L.$
Answer:
Let's think step by step.

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Let $L$ be the line in space that passes through the origin and the point $(2,1,-2).$  Find the reflection of the point $(3,6,15)$ across $L.$
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