Simplify this solution block

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Seems like it also works without Vectorize?

Yes, it does, because Mathcad applies implicit vectorization. If this works OK depends on the calculations used. E.g. if you replace Q^2 by Q*Q you will get a different, wrong result if you don't use vectorization (because Q*Q is evaluated as scalar product of the two vectors).

So its best that whenever you want vectorization (evaluating an expression with vector feed element by element) to be done, explicitly apply it and don't rely on Mathcads implicit vectorization to be done.