Solving for quadratic equations: help?

Question

solve thank u again

3) r^2 + 10r + 9 = 0

4) x^2 = 16

Answer 1

(r + 9)(r + 1) = 0

r = - 9 , r = - 1

x² = 16

x = ± 4

Why do you refer to questions 3) and 4) as opposed to 1) and 2) ? !!!!

Answer 2

Where's the question?

Standard Form:

           Ax^2 + Bx + C = 9

If you're looking for the numerical coefficient:

3) a=1 b=10 c=9

4)a=1 b=0 c= -16