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# Matrices Questions

Anonymous
wrote...
3 months ago
 Matrices Questions Need help, all information is in the uploaded photo.TranscribedA lamp of weight $$W = 50(1 + \sqrt(3))$$ N is fixed to a wall by a two-bar truss with forces F1 and F2 exerting at the lamp attachment point as shown in the figure below. From the equilibrium forces and moments, the magnitudes F1 = IlF1Il and F2 = IlF2Il satisfy the following system equations: (a) Write the system of linear equations in matrix form Ax = b, where (b) Find F1 and F2 by using Gaussian elimination on the augmented matrix. (c) Find F1 and F2 using the matrix inverse $$A^-1$$. Attached file  Thumbnail(s): You must login or register to gain access to this attachment. Read 160 times 4 Replies
Replies
wrote...
3 months ago
 Hi, see question 2 of this document. Does it answer the question? Attached file  SOLUTIONS_MZB125_172_Prac_exam.pdf.pdf (92.77 KB) You must login or register to gain access to this attachment.
Anonymous Author
wrote...
3 months ago
 i cant understand gaussian elimination, do you have any explanations on how to solve the question? The question is also not the same as the one ive uploaded as b and c are merged into one on the one you have provided. Thanks
wrote...
Educator
3 months ago
 Gaussian elimination is when you make the leading diagonal into 1's, and the numbers below them are zeros.1 3 4 20 1 3 40 0 1 3Something like this.. Then you apply back substitution to find the actual value of the variables that satisfy each equation. Working on a follow-up!
fgarza2146fgarza2146
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Posts: 124
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3 months ago