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The vertex is at (-1,0).
y = x +1 is the equation of a straight line and so has no vertex.
y = x2 + 14x + 21 a = 1, b = 14 x = -b/2a = -14/2*1 = -7
Need signs between terms.
The vertex coordinate point of the vertex of the parabola y = 24-6x-3x^2 when plotted on the Cartesian plane is at (-1, 27) which can also be found by completing the square.