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Calculate the area of a parallelogram with adjacent sides represented by vectors (2i - 3k) and (4j - 2k).

Mathematics

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Answer

(b)414\text{(b)} 4\sqrt{14}

Step-by-step solution

5 steps
  1. Identify the given adjacent sides of the parallelogram as vectors.

    Let a⃗\vec{a} and b⃗\vec{b} be the adjacent sides.

    a⃗=2i^−3k^=2i^+0j^−3k^\vec{a} = 2\hat{i} - 3\hat{k} = 2\hat{i} + 0\hat{j} - 3\hat{k} b⃗=4j^−2k^=0i^+4j^−2k^\vec{b} = 4\hat{j} - 2\hat{k} = 0\hat{i} + 4\hat{j} - 2\hat{k}
  2. Calculate the cross product of the two vectors, a⃗×b⃗\vec{a} \times \vec{b}.

    The area of the parallelogram is given by the magnitude of the cross product of its adjacent sides.

    a⃗×b⃗=∣i^j^k^20−304−2∣\vec{a} \times \vec{b} = \begin{vmatrix} \hat{i} & \hat{j} & \hat{k} \\ 2 & 0 & -3 \\ 0 & 4 & -2 \end{vmatrix} a⃗×b⃗=i^((0)(−2)−(−3)(4))−j^((2)(−2)−(−3)(0))+k^((2)(4)−(0)(0))\vec{a} \times \vec{b} = \hat{i}((0)(-2) - (-3)(4)) - \hat{j}((2)(-2) - (-3)(0)) + \hat{k}((2)(4) - (0)(0)) a⃗×b⃗=i^(0−(−12))−j^(−4−0)+k^(8−0)\vec{a} \times \vec{b} = \hat{i}(0 - (-12)) - \hat{j}(-4 - 0) + \hat{k}(8 - 0) a⃗×b⃗=12i^+4j^+8k^\vec{a} \times \vec{b} = 12\hat{i} + 4\hat{j} + 8\hat{k}
  3. Calculate the magnitude of the cross product.

    The area of the parallelogram is ∣∣a⃗×b⃗∣∣||\vec{a} \times \vec{b}||.

    ∣∣a⃗×b⃗∣∣=(12)2+(4)2+(8)2||\vec{a} \times \vec{b}|| = \sqrt{(12)^2 + (4)^2 + (8)^2} ∣∣a⃗×b⃗∣∣=144+16+64||\vec{a} \times \vec{b}|| = \sqrt{144 + 16 + 64} ∣∣a⃗×b⃗∣∣=224||\vec{a} \times \vec{b}|| = \sqrt{224}
  4. Simplify the radical.

    To simplify 224\sqrt{224}, find the largest perfect square factor of 224.
    224=16×14224 = 16 \times 14

    ∣∣a⃗×b⃗∣∣=16×14||\vec{a} \times \vec{b}|| = \sqrt{16 \times 14} ∣∣a⃗×b⃗∣∣=16×14||\vec{a} \times \vec{b}|| = \sqrt{16} \times \sqrt{14} ∣∣a⃗×b⃗∣∣=414||\vec{a} \times \vec{b}|| = 4\sqrt{14}
  5. Compare the result with the given options.

    The calculated area is 4144\sqrt{14}. This matches option (b).

    The final answer is (b)414\text{(b)} 4\sqrt{14}.

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