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Subtraction of vectors

ab is simply equal to a + (-b). To find ab, add -b to a:

Figure 10

When you want to add vectors, just think of them as displacements (even if they are not): perform one displacement (draw one vector), then from its final point perform the second displacement (place the second arrow so that its tail is at the head of the first). Draw a third arrow, the resultant, from the start of the first displacement to the end of the second displacement.

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