Posted by **benjamin** on Friday, August 28, 2009 at 3:14pm.

Vector A has a magnitude of 8.00 units and makes an angle of 45.0° with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A + B and (b) the vector difference A – B.

Could someone please show me how this problem is done, maybe even with a graph somehow? Thanks

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**bobpursley**, Friday, August 28, 2009 at 5:09pm
Vectors are directed. When the problem says " is directed along the negative x axis" IT DOES NOT MEAN that. It means the vector is in the same direction as the negative x axis.

Draw from the origin the A vector. At its tip,put a little arrow head. Now, in the DIRECTION of the negative x axis, from the tip of A, draw B.

A+B will then be the vector from the origin to the tip of B.

Now for A-B. From the tip of A, draw B but in the direction of +x axis. From the origin to the tip of that reversed B is A-B.

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**MathMate**, Friday, August 28, 2009 at 5:33pm
See

http://i263.photobucket.com/albums/ii157/mathmate/VECTORS.jpg

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**Anonymous**, Saturday, August 3, 2013 at 4:33am
vecter a has a magnitude of 8.00 uints and makes an angle of 45.0with the positive x-axis?

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