how to find multiply variable in matrix multiplication

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function least_square;
x=[1 2 3 4 5];
y=[4;2;5;3;7];
n=numel(x);
for i=1:n
A(i,1)=1;
A(i,2)=x(i);
A(i,3)=x(i).^2;
end
we have matrix A(5x3) and matrix y(5x1) let a matrix a(3x1) satisfy Aa=y so any function or method to find matrix a?
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KSSV
KSSV 2018-5-29

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