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maka a.b = 2(0) + (-3)(5) + 4(1) = 0 - 15 + 4 = -11
= 10ij + 2ik - 15j^2 - 3jk + 20jk + 4k^2
= 10ij + 2ik - 15j^2 + 17jk + 4k^2