SOLUTION: i need help solving the equation graphically and then checking the results algebraially {{{3x^2+12x=-9}}}

Question 775456: i need help solving the equation graphically and then checking the results algebraially
Answer by sofiyac(983) (Show Source): You can put this solution on YOUR website!

instead of 0 put y there

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

looks like solutions fall at x=-3 and x=-1 so now plug those values in one at a time to check the solutions

if x=-3 then
27-36=-9
-9=-9 left=right
if x=-1 then
3-12=-9
-9=-9 left=right

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