We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
233
2
avatar+189 

Graph ​ f(x)=(x+2)(x−4)

Use the parabola tool then choose the vertex followed by one point on the parabola.

 Jan 15, 2019
 #1
avatar+102320 
+2

(x + 2)(x - 4)     expand

 

x^2 + 2x - 4x - 8

 

x^2 - 2x - 8

 

The x coordinate of the vertex is  -(-2) / (2 * 1)  =   2 /2  = 1

The y coordinate of the vertex is  (1)^2 - 2(1) - 8  =  1 - 2 - 8  =  -9

So...the vertex is (1, - 9)

 

A second point can be found if we let x = 0

(0)^2 - 2(0) - 8  =

-8

So  (0, - 8)  is on the graph

 

Here's the graph :  https://www.desmos.com/calculator/tgpdpinlno

 

 

cool cool cool

 Jan 15, 2019
 #2
avatar+189 
+1

thanks you

 Jan 15, 2019

24 Online Users