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Problem If a = 2 i ^ − 3 j ^ + k ^ \mathbf{a} = 2\hat{i} - 3\hat{j} + \hat{k} a = 2 i ^ − 3 j ^ + k ^ b = − i ^ + k ^ \mathbf{b} = -\hat{i} + \hat{k} b = − i ^ + k ^ c = 2 j ^ − k ^ \mathbf{c} = 2\hat{j} - \hat{k} c = 2 j ^ − k ^ a + b \mathbf{a} + \mathbf{b} a + b b + c \mathbf{b} + \mathbf{c} b + c 21 \sqrt{21} 21 2 21 2\sqrt{21} 2 21 1 2 21 \frac{1}{2}\sqrt{21} 2 1 21 Browse the problem library