Mathematics for IGCSE & O level - Vectors (Section 3 - No. 45)

Given the vectors a=[2, 1] and b=[3, -2], what is 2a - b?

[1, 4]

[1, 0]

[-1, 4]

[4, -3]

解释

2a = [4, 2]. 2a - b = [4-3, 2-(-2)] = [1, 4]

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