Excel Solver

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1. In excel 2007 / 2010 add function "Solver"
Excel Options / Add-Ins / Manage / Excel Add-ins / Solver Add-in
Find in the menu, Data / Solver

2. Example in attachment
There are 5 parameters A1, A2, A3, A4, A5 
Input the data "House Size / Lot Size / Bedrooms / Granite / Bathroom / Selling Pirce"
Put formular "=C2*$B$2+D2*$B$3+E2*$B$4+F2*$B$5+G2*$B$6" into Prediction
Put formular "=I2-H2" into Difference
Put formular "=J2^2" into Square
Run the solver
Input the parameter, and click solve
At last It will find out the parameter value.

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