Question: Consider the matrix form of a linear regression model: Y = XB + e . . Show that the least squares estimator of B is

Consider the matrix form of a linear regression model: Y=XB+e.. Show that
the least squares estimator of B is given by b=(X'X)^-1 X'Y. Hello, can u solve this? I dont understand how d/db b'X'Xb =2X'Xb. Can you help?

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