If p = 2i + 3j and q = 5i - j, find p · q (the dot product of p and q).
A7CORRECT
B10
C13
D17
GCEFurther MathematicsVectors2022
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Why the answer is A, and why the others tempt you.
The dot product p · q = (2)(5) + (3)(-1) = 10 - 3 = 7. Multiplying corresponding components and summing gives 7.
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