+0  
 
+1
51
3
avatar+809 

A parabola with equation \(y=x^2+bx+c\) passes through the points (2,3) and (4,3). What is c?

 Dec 29, 2018
 #1
avatar+15350 
+4

Sub in the poitns given:

3 = 2^2 + 2b +c     and

3 = 4^2 + 4b +c       Now solve for c   (Multiply first equation by -2  then add it to the second equation....you'll find c = 11)

 Dec 29, 2018
 #2
avatar+3729 
+3

Here's a graph on EP's response: 

 

I might have to change it, took quite a while!

 Dec 29, 2018
 #3
avatar+15350 
+2

Same graph.....from Desmos.....

 

 Dec 29, 2018

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