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The initial point of a is (−1,6), and its terminal point is (−3,−2). What is the value of ‖a‖? Enter your answer, as a simplified radical
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‖a‖ =
We have [ ( -3 - (-1) , (-2 - 6) ] = [ -2 , - 8 ]
The length of this veector = ll a ll = √ [ ( -2)^2 + (-8)^2 ] = √ [ 4 + 64 ] = √68 =
√4 * √17 =
2√17
+4 
