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LeastSquares

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LeastSquares[m, b]

computes the least squares solution to m x = b, finding
an x that solves for b optimally.

• • LeastSquares[{{1, 2}, {2, 3}, {5, 6}}, {1, 5, 3}]

• • Simplify[LeastSquares[{{1, 2}, {2, 3}, {5, 6}}, {1, x, 3}]]

• • LeastSquares[{{1, 1, 1}, {1, 1, 2}}, {1, 3}]