Find an equation in standard form of the parabola that passes through (-2, 9), (-4, 5), and (1, 0)

We know the parabolic function:

We will use the points to form the equation (-2,9) we will get:

Now, using (-4,5) we will get:

Now, using (1,0) we will get:

Now, using these three equations we will find a,b and c

On solving equations: a=-1,b=-4 and c=5

Now, using a,b and c in the general equation we get:

answer:

i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!