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Question

The vectors u\mathbf { u } and v\mathbf { v} are given. Calculate the dot product uv\mathbf { u } \cdot \mathbf { v }. u=4,5,6\mathbf { u } = \langle 4,5 , - 6 \rangle, v=0,2,3\mathbf { v } = \langle 0 , - 2 , - 3 \rangle

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Answered 9 months ago
Answered 9 months ago
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Given that

u=u1,u2,u3=4,5,6,\boldsymbol{u} = \langle u_1,u_2,u_3 \rangle = \langle 4,5,-6 \rangle,

v=v1,v2,v3=0,2,3.\boldsymbol{v} = \langle v_1,v_2,v_3 \rangle = \langle 0,-2,-3 \rangle.

Substitute the vector components into the formula for the dot product:

uv=u1v1+u2v2+u3v3=4(0)+5(2)+(6)(3)=010+18=8\begin{aligned} \boldsymbol{u} \cdot \boldsymbol{v} &=& u_1 v_1 + u_2 v_2 + u_3 v_3 \\ &=& 4(0)+5(-2)+(-6)(-3) \\ &=& 0-10+18 \\ &=& 8 \end{aligned}

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