where vector is an n ×1 (or 1 ×n) vector containing the coefficients of an (n-1) degree polynomial with the coefficients arranged in order of decreasing powers. The POLYROOT function returns the array ...

First we need to complete the square to get the coordinates of the turning point. \(y = {x^2} + 2x + 3\) \(y = {(x + 1)^2} - 1 + 3\) \(y = {(x + 1)^2} + 2\) Therefore ...