Question 1179633
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
a. y = x^2 + 9                V(0,9)  axis of symmetry:  x = 0
b. y = -2(x - 1)^2            V(1,0)  axis of symmetry:  x = 1
c. y = -2(x - 1)^2 + 2        V(1,2)  axis of symmetry:  x = 1
d. y = 1/2 (x + 3)^2 - 1      V(-3,-1)  axis of symmetry:  x =-3

{{{drawing(300,300,    -10,10,-10,10,  blue(line(1,10,1,-10))  ,  blue(line(-3,10,-3,-10))  ,  
 grid(1),

graph( 300, 300, -10,10,-10,10,0,x^2 + 9,-2(x - 1)^2 , -2(x - 1)^2 + 2 ,  .5*(x + 3)^2 - 1    ))}}}

Wish You the Best in your Studies.
</font></b></pre>