SOLUTION: How do you graph {{{y<2x^2+6x+1}}} and {{{y<= -2x^2-3x-1}}} on the same graph and shade?

Algebra ->  Graphs -> SOLUTION: How do you graph {{{y<2x^2+6x+1}}} and {{{y<= -2x^2-3x-1}}} on the same graph and shade?      Log On


   



Question 239592: How do you graph y%3C2x%5E2%2B6x%2B1 and y%3C=+-2x%5E2-3x-1 on the same graph and shade?
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
How do you graph y%3C2x%5E2%2B6x%2B1 and y%3C=+-2x%5E2-3x-1 on the same graph and shade?

First draw the boudary of +y%3C2x%5E2%2B6x%2B1 which is the parabola
whose equation is just like the inequality except that an equal
sign replaces the < .  

So draw the graph of the boundary parabola,

+y=2x%5E2%2B6x%2B1

by plotting these points (-3,1), (-2,-3), (-1.5, -3.5), (-1,-3), (0,1) 

but draw it dotted since the inequality has %22%22%3C%22%22 and not %22%22%3C=%22%22



The graph will be shaded somewhere BELOW this curve.

Next draw the other boundary curve by plotting the 

points (-2,-3), (-.75,-.125) ,(-1,0)

but draw it solid since the inequality has %22%22%3C=%22%22, not %22%22%3C%22%22. 



Now we shade the part that is below both curves, since
one is %22%22%3C%22%22 and the other %22%22%3C=%22%22.  

Shade the part indicated below where it says 
"SHADE THIS REGION"



Edwin