Mathematics for IGCSE & O level - Vectors (Section 5 - No. 31)

Given vector a = [3, -2], which of the following vectors is equal to -2a?

[6, -4]

[-6, 4]

[5, 0]

[-1, 4]

解释

-2a = -2 * [3, -2] = [-6, 4]

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