The vectors that represent the reflection of the vector across the x-axis are; <3, 7> and [tex]\left[\begin{array}{ccc}3\\7\end{array}\right][/tex].
Explanation of how reflection across axis works?
When a graph is reflected along an axis, say x axis, then that leads the graph to go just in opposite side of the axis as if we're seeing it in a mirror.
If we study it more, you will find that its symmetric, thus each point is equidistant from the axis of reflection as that of the image of that point.
The vectors that represent the reflection of the vector across the x-axis are;
<3, 7> and [tex]\left[\begin{array}{ccc}3\\7\end{array}\right][/tex].
Learn more about vectors;
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