Let and . Calculate…

MATHEMATICS · Single correct · A Level · Mathematics · Vectors · Vectors

Problem

Let p=(1,4,−2)\mathbf p = (1,4,-2) and q=(3,−1,5)\mathbf q = (3,-1,5). Calculate (2p−q)⋅(p+q)(2\mathbf p-\mathbf q)\cdot(\mathbf p+\mathbf q). (a) 4444 (b) −14-14 (c) −4-4 (d) 77

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