Problem

Calculate $\operatorname{proj}_{v} v_{0}$ Where $v=\langle 4,-6\rangle$ and $w=\langle 4,3\rangle$. Select one: a. $\left\langle-\frac{20}{7},-\frac{75}{26}\right\}$ b. $\left\langle\frac{10}{13},-\frac{6}{25}\right\rangle$ c. $\left\langle-\frac{8}{25}, \frac{15}{26}\right\rangle$ d. $\left\langle\frac{10}{13}, \frac{15}{26}\right\rangle$ e. $\left\langle-\frac{8}{25},-\frac{6}{25}\right\rangle$

Solution

Step 1 :We have that

Step 2 :\[\operatorname{proj}_{v} w = \frac{v \cdot w}{v \cdot v} v\]

Step 3 :Substitute the given vectors into the formula

Step 4 :\[\operatorname{proj}_{v} w = \frac{\langle 4,-6 \rangle \cdot \langle 4,3 \rangle}{\langle 4,-6 \rangle \cdot \langle 4,-6 \rangle} \langle 4,-6 \rangle\]

Step 5 :Calculate the dot product of the vectors

Step 6 :\[\operatorname{proj}_{v} w = \frac{16 - 18}{16 + 36} \langle 4,-6 \rangle\]

Step 7 :Simplify the fraction

Step 8 :\[\operatorname{proj}_{v} w = \frac{-2}{52} \langle 4,-6 \rangle\]

Step 9 :Calculate the scalar multiplication

Step 10 :\[\operatorname{proj}_{v} w = \langle -\frac{8}{52}, \frac{12}{52} \rangle\]

Step 11 :Simplify the vector

Step 12 :\[\operatorname{proj}_{v} w = \boxed{\langle -\frac{2}{13}, \frac{3}{13} \rangle}\]

From Solvely APP
Source: https://solvelyapp.com/problems/16399/

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