Quadratics, SMB-008 By completing the square, find the coordinates of the vertex of the parabola with equation `y=x^2+8x+9` (3 marks) Show Answers Only `(-4,-7)` Show Worked Solution `y` `=x^2+8x+9` `=x^2+8x+16-7` `=(x+4)^2-7` `:.\ text{Vertex}\ = (-4,-7)`