Question

Find the dot product for u = { 3, -2} and v = {-5, 1}

Answer 1

Answer is -17

Explanation:

Express in vectorial form:

`{ \rm{u = \binom{3}{ - 2} }} \\ \\ { \rm{v = \binom{ - 5}{1} }}`

• Then the dot product:

`{ \rm{u•v = (3 * - 5) + ( - 2 * 1)}} \\ \\ { \rm{u•v = - 15 - 2}} \\ \\ { \rm{u•v = - 17}}`