1. Use a MATLAB script to find the least squares fit to the four-dimensional quadratic
\(f(x, y, z) = a_1x^2 + a_2y^2 + a_3z^2 + a_4xy + a_5xz + a_6yz + a_7x + a_8y + a_9z + a_{10}\)
given the data found in the file \"data.txt\". (The data in that file is in the format $x_i, y_i, z_i, f_i$
for each row $i$. Use the MATLAB function \"dlmread\" to read the data into a matrix.)