Vectors $\mathbf{a}$ and $\mathbf{b}$ satisfy $\|\mathbf{a}\| = 3$ and $\|\mathbf{b}\| = 8.$  Also, the angle between vectors $\mathbf{a}$ and $\mathbf{b}$ is $135^\circ.$  Find $\|2 \mathbf{a} + \mathbf{b}\|^2.$
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Vectors $\mathbf{a}$ and $\mathbf{b}$ satisfy $\|\mathbf{a}\| = 3$ and $\|\mathbf{b}\| = 8.$  Also, the angle between vectors $\mathbf{a}$ and $\mathbf{b}$ is $135^\circ.$  Find $\|2 \mathbf{a} + \mathbf{b}\|^2.$
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user
100 - 48 \sqrt{2}
Vectors $\mathbf{a}$ and $\mathbf{b}$ satisfy $\|\mathbf{a}\| = 3$ and $\|\mathbf{b}\| = 8.$  Also, the angle between vectors $\mathbf{a}$ and $\mathbf{b}$ is $135^\circ.$  Find $\|2 \mathbf{a} + \mathbf{b}\|^2.$
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