Question: Basic matrix multiplication

Suppose that 

u1=<388, -635, -480, 554, -288, 732, -118>

u2=< -987, 789, 487, -919, 248, 994, -807>

u3=-316, -470, -522, -769, -159, 629, 806>

u4=<381, 740, -834, 722, -46, 49, 795>

 

Suppose that Av=(b1  b2  ⋯  b7)^T .

       Enter the value of b1  in the box below.

 

Can anyone help with this question with a step by step solution. TIA.

      

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