Matrices FAQ

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  • Must I use the inverse from earlier parts of the question to solve the simultaneous equations from later parts?\Must I use the matrix equation found/proven from earlier parts of the question to find the inverse to solve the simultaneous equations from later parts?
    • Yes.
    • Even if there is NO "hence/deduce" stated in the question?
      • Yes. Unless it stated "hence/deduce, or otherwise" (unlikely though)
    • What if the matrix aren't the same?
      • You need to rearrange the equations first.
    • Can't I use the adjoin method instead?
      • You can. You just won't get any marks. ;-)
    • I don't know how to find the inverse from the matrix equation found/proven. Should I skip the simultaneous equations/problem solving to follow?
      • Depending on that particular marking scheme, you still could get marks for the problem solving, provided your matrix in the second part is the same as the one in the first part. You won't be given marks for finding the inverse though, which is why in this situation, use the calculator directly to find the inverse and DON'T waste time to do the adjoin method.
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