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C       t   s   u   v
0.0001  1   2   3   4
0.0002  5   6   7   8
0.0003  9   0   1   2
37 in total

K = SUM [C * a1^t * a2^s * a3^u * a4^v]

Although not precisely correct, I gather most of you will figure out how the above looks like.

a's are known.

Is it possible to do this as a one liner in Excel, instead of making another column for the product, then summing them up down below?

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where are the As stored? – nutsch Nov 28 '12 at 20:15
@nutsch - Anywhere within that sheet. They're constant so ... $N$34 is a1, and so on ... – Rook Nov 28 '12 at 20:51

Try using this formula, entered with Ctrl+Shift+Enter as an array formula:

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