What are the axis of symmetry and vertex of the quadratic function y=-2x^2-8x+5

recall that the axis of symmetry for a vertical parabola is simply the equation for the vertical line of the vertex's x-coordinate.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.