Question: x = ( A T A ) - 1 A T b Similar to x = A - 1 b b Use x = A

x=(ATA)-1ATb
Similar to x=A-1b
b Use x=A-1b when square Use x=(ATA)-1ATb when A has more rows than cols
x=(ATA)-1ATb Similar to x=A-1b b Use x=A-1b when square Use x=(ATA)-1ATb

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