+0  
 
0
180
2
avatar+2980 

Help.

NotSoSmart  Nov 1, 2017
 #1
avatar+88826 
+1

Look at this, NSS

 

In the form

 

ax^2  +  bx  + c

 

The x coordinate of the vertex   is given by    -b / [ -2a ]

 

So we have

 

-2x^2  + 8x  - 18

 

So......b = 8   and   a  = -2

 

So.......the x coordinate of the vertex  is   [ -8 ] / [ 2 * -2 ]  =  -8/-4  =  2

 

And the axis of symmetry has the same value  ⇒     x  =  2

 

We could find the y value of the function by  putting 2 back into it, but we don't have to in this case

 

The first answer is the only one that makes sense

 

 

cool cool cool

CPhill  Nov 1, 2017
 #2
avatar+88826 
+1

For the second one.....the vertex  is  (10, 60)

 

The seconds are on the x axis and the speed is on the y axis.....so.......

 

 It takes 10 seconds for the car to reach 60 mph

 

 

cool cool cool

CPhill  Nov 1, 2017

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