3. The forces in three members of a framework are F,, F2 and F2. They are related by the simultaneous equations shown below: 4F, + 2.8F, + 2.8F, = 5.6 4.2F, – 1.4F, + 5.6F3 = 35.0 2F, + 2.8F, – 1.4F3 = -5.6 Find the values of F,, F2 and F, up to four significant figures using the following methods: a. Determinants b. Cramer's rule C. Gaussian elimination

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