anonymous
  • anonymous
I'm really stuck with this and would love some help: u and v are vectors such that: (u - v)(3u + 5v) = -114 (u-v)(u + 2v) = -45 uv=4 (These three are dot products) Therefore |u X v| = ? (vector multiplication) Thank you!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
hint: to solve ur question Let’s consider a vector v whose initial point is the origin in an xy - coordinate system and whose terminal point is . We say that the vector is in standard position and refer to it as a position vector. Note that the ordered pair defines the vector uniquely. Thus we can use to denote the vector. To emphasize that we are thinking of a vector and to avoid the confusion of notation with ordered - pair and interval notation, we generally write v = < a, b >. The coordinate a is the scalar horizontal component of the vector, and the coordinate b is the scalar vertical component of the vector. By scalar, we mean a numerical quantity rather than a vector quantity. Thus, is considered to be the component form of v. Note that a and b are NOT vectors and should not be confused with the vector component definition. Now consider with A = (x1, y1) and C = (x2, y2). Let’s see how to find the position vector equivalent to . As you can see in the figure below, the initial point A is relocated to the origin (0, 0). The coordinates of P are found by subtracting the coordinates of A from the coordinates of C. Thus, P = (x2 - x1, y2 - y1) and the position vector is . It can be shown that and have the same magnitude and direction and are therefore equivalent. Thus, = = < x2 - x1, y2 - y1 >. The component form of with A = (x1, y1) and C = (x2, y2) is = < x2 - x1, y2 - y1 >.
anonymous
  • anonymous
Thanks but that doesn't really address the question
anonymous
  • anonymous
see it carefully

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