Least squared matrix error

is this a right approach to calculate the least squared error x* to this problem? this is what I'm getting:

Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 6.291272e-19.

> In P2 (line 7)

x =

0.5510

0.0408

Any help will be greatly appreciated

A = [1 2; 3 4; 5 6; 7 8; 9 0]

b = [1; 2; 3; 4; 5]

A'*inv(A*A');

x = lsqr(A,b)