question 12) axis of symmetry at x=-5, a maximum height of 9, and passes through the point (-7,1). write the equation of the parabola in vertex form.

question 17) what is the vertex form of this equation? y=-x^2+12x-4

question 18) write the expression in factored form? 2x^2+16x+24

question 19) write in quadratic formula to solve the equation. x^2-7x-6=0

question 20) simplify the expression (-2i)(8i)