Help, what am I doing wrong here. Mathcad 15 file and pdf attached.
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Thanks. I didn't even notice there were two |x| operators. That fixed it.
Its the same symbol which can be interpreted in two different ways ("Absolute Value" or "Square Matrix Determinant").
Normally Mathcad tries to automatically detect what you mean and interprets accordingly, but sometimes it can't.
You can change the meaning of the operator yourself by right-clicking the expression and choosing the appropriate:
I considered that (norm of a vector), but have to disagree, because in essence it's the same as 'absolute value'. And also the same as 'modulus of a complex value', by the way.
The operation in all cases is to take the root of the sum of the squares of all 'elements' provided through the argument of the operator.