Question

555555

Answer 1

one suggestion use a 2nd degree
ax^2 + bx + c a parabola
let your a be a factor of c
different format the vertex form by completing the square
a(x-h)^2 + k = 0 where h = -b/(2a) and k = f(h)
h is the x-coordinate of the vertex

Answer 2

your +2 has a typo and no
all you did here was rearrange the terms

Answer 3

factors what you multiply to get the product