Algebra 1: Common Core (15th Edition)

The formula for the axis of symmetry and the x-coordinate of the vertex is: $x=\frac{-b}{2a}=\frac{-3}{2.2}=\frac{-3}{4}=-0.75$ To find the y-coordinate of the vertex, substitute the value for x into the equation and solve for y: $y=2(-0.75)^2+3(-0.75)-1$ $y=-2.125$ The correct answer is A.