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GATE 2014 _ 28 [IN]

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A scalar valued function is defined as
$$f(x) = x^T Ax + b^Tx + c$$

where A = symmetric +ve definite matrix with diamension n*n

            x = are vectors of dimension  n* 1
The min value of  f(x) will occur when x equals

  1.  (ATA )-1B
  2. - (ATA )-1B
  3. -(A-1B) / 2
  4. (A-1B) / 2
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