Question 775456
{{{3x^2+12x=-9}}} 
{{{3x^2+12x+9=0}}} instead of 0 put y there 
{{{3x^2+12x+9=y}}} 
now make a table of x and y, plug in any value of x you want and solve for y, do this about 5 times so you have 5 points. Example if x=0 then y=9 so first point could be (0,9) and so on. Then plot the points and connect the dots
 {{{ graph( 300, 200, -5, 1, -10, 10, 3x^2+12x+9) }}} 
looks like solutions fall at x=-3 and x=-1 so now plug those values in one at a time to check the solutions
{{{3x^2+12x=-9}}} 
if x=-3 then
27-36=-9
-9=-9 left=right
if x=-1 then
3-12=-9
-9=-9 left=right