Mathematics for IGCSE & O level - Vectors (Section 3 - No. 29)
If a vector a = [2, 3], what does -2a represent?
A vector with the same magnitude as a, but in the opposite direction.
A vector twice as long as a, in the same direction.
A vector twice as long as a, but in the opposite direction.
A vector with the same magnitude as a, and same direction.
توضیح
-2a results in a vector scaled by 2 and flipped direction.