Question

sketch the graph of the following functions :

k(x)=-9x+5x-3x^2
( this is the method i use )

-3x^2 +5x -9
-3[ X+5/2(-3) ]^2 + (-9)-5^2/ 4(-3)

-3 ( x + 5/ -6)^2 -83/12
a= -3 <0
mid pont: (5/-6 , -83/12)
EQN x : 5/6 , 5/6
y= -9

but how about the graph?
can someone show me?

Answer 1

http://www.wolframalpha.com/input/?i=-3x%5E2%2B5x-9