Question 143007: Can someone please help me?
the magnitude of the vector -3i-5j is
a. -4
b. 4
c. sqrt 26
d. sqrt 34 Answer by vleith(2983) (Show Source):
You can put this solution on YOUR website! When looking at a vector, you need to look at the the 'size' or amplitude of the the vector. A vector has an x component and a y component (or in your case, an i and a j).
Look at the vector like a hypotenuse of a right triangle where the two legs are given in terms of i an j.
You know that in a right triangle,
Thus, in this case
Got it?
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